The Drill Bit Set You Actually Need (and Why the 200-Piece Kit Is a Waste)

The real best drill bit set for cordless drill users

Walk past the 200 piece drill bit kit at the home center and you mostly see marketing, not value. For a cordless drill that earns its keep, the best drill bit set for cordless drill work is a tight group of about 15 to 20 bits that actually touch wood, metal, and masonry every week. A focused bit set beats a bloated piece set because every bit, shank, and head is chosen for real jobs, not for filling plastic trays.

For general carpentry and property maintenance, start with a compact twist drill index in high speed steel covering common sizes from 2 mm up to 10 mm. Those HSS drill bits handle soft steel, plastics, and most woods, and when paired with a cordless drill impact mode they still track straight if the tips are sharp and the split point geometry is decent. Independent tests from outfits like Project Farm and Pro Tool Reviews, which measure hole straightness, drilling speed, and wear over dozens of holes, routinely show that basic HSS twist bits with a 135° split point, such as the DeWalt DW1354 or Bosch HCBG700, drill more accurately and last longer than no-name carbon steel assortments.

Add a few brad point wood drill bits in the same sizes and you will notice cleaner entry holes in cabinets and trim where a ragged edge looks amateur. Sets like the Fisch FSF-328094 or Bosch Brad Point NS5006, for example, consistently leave sharp shoulders and minimal tear-out in plywood and melamine when driven by a mid-range 18V cordless drill. In comparative shop trials that track breakout diameter and surface chipping, these brad point sets typically cut 20 to 30 percent cleaner than standard twist bits, and that kind of repeatable performance is what makes a compact, well-chosen drill bit set feel like a professional upgrade instead of just another accessory.

The 15 to 20 bits that cover almost every job

Instead of chasing the biggest bit sets on the shelf, build a lean kit around specific tasks you actually face in rentals, remodels, and punch lists. For wood and light metal, a compact bit set of 13 twist drill bits in high speed steel with a split point tip from 2 mm to 10 mm will cover pilot holes, clearance holes, and most anchor work. Add 5 brad point wood bits in the same sizes and your cordless drill suddenly feels like the best drill for clean, accurate carpentry.

Metal work is where cobalt earns its keep, so keep a small cobalt drill bit kit in the box for drilling into stainless steel brackets, hardened screws, and thicker angle iron. A 6 piece cobalt bit set with common sizes around 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm is enough, and you do not need a 29 piece set unless you fabricate metal every day. In controlled shop tests that log holes drilled to failure in 304 stainless plate at a fixed feed rate, compact cobalt sets such as the Milwaukee Red Helix Cobalt 48-89-2331 or the Irwin M-35 Cobalt 3018002 routinely outlast standard HSS bits by two to three times, often surviving 40 to 60 holes where entry level HSS taps out around 15 to 20.

For masonry, keep a short row of carbide tipped drill bits sized for plastic anchors and sleeve anchors you actually use. Three masonry drill bit sizes, often 5 mm, 6 mm, and 8 mm, will handle most tap in anchors and light duty fixings in brick or block without needing a huge masonry bit set. Round out the kit with a few spade bits for rough through holes in studs, and your cordless drill impact driver combo now covers almost every hole you will drill in a typical week.

Why bulk bit sets and 200 piece kits waste your money

Those giant 200 piece drill bit kits stacked near the checkout look like a bargain, but most of the bits never touch a chuck. You get endless duplicates of the same tiny drill bit sizes, a handful of soft screwdriver bits, and a plastic case that breaks before your first impact driver does. The best drill bit set for cordless drill work is not the one with the highest piece count, but the one where every bit and shank earns its place.

Bulk bit sets often mix low grade carbon steel and high carbon steel bits with no clear labeling, so you do not know which drill bits can safely hit stainless steel or hardened fasteners. Many of the included screwdriver bit pieces are not impact rated, which means they twist, mushroom, or snap when you run them in a drill impact mode or a full power impact driver. In comparative testing by reviewers who track torque cycles to failure and tip wear, generic 200 piece assortments frequently show visible torsional twist and tip rounding after fewer than 50 decking screws, while S2 steel impact bits from brands like Milwaukee Shockwave 48-32-4023 or Makita Gold T-01725 routinely drive several hundred screws before measurable wear.

Another hidden cost is poor machining on the hex shank and head of bargain driver bits, which leads to wobble, runout, and stripped fasteners. A cordless drill with a clean chuck and a straight hex shank driver bit feels precise, while a sloppy bit set makes even the best drill feel cheap and inaccurate. If you want masonry performance that actually matches the promises on the box, a focused guide to carbide masonry bits that outlast the drill will do more for your work than any 200 piece kit stacked on a discount pallet.

Bit materials, shank styles, and impact ratings that actually matter

Material is where a drill bit either survives or dies, especially when you push a cordless drill hard in metal or masonry. High speed steel is the baseline for general purpose drill bits, while cobalt and carbide tipped bits step in when stainless steel, cast iron, or concrete enter the picture. Black oxide and titanium coatings help with lubrication and corrosion, but they do not turn a soft carbon steel bit into a miracle worker.

For metal, cobalt drill bits with a split point tip reduce walking and heat, which matters when you are drilling through a steel bracket overhead with one hand on the drill. Stainless steel and hardened fasteners demand either cobalt or carbide tipped bits, because standard high carbon steel bits dull quickly and start smoking long before the hole is done. In side by side trials that log drilling time and tip temperature, M-35 cobalt bits such as the Bosch CO2135 or DeWalt DW1263 typically maintain cutting speed and edge integrity for multiple passes in 3 mm stainless where entry level HSS bits stall, chatter, and blue after a single hole.

Shank style also matters, especially if you swap between a cordless drill and an impact driver during the same job. A 6.35 mm hex shank lets driver bits and small drill bits lock into an impact driver, but only impact rated bits should ever see that hammering drill impact load. If you want a deeper look at matching sockets, bits, and shank styles to your tools, a dedicated guide on choosing the right drill socket set for cordless drills will help you build a kit that works as a system.

Brands, prices, and where a pro should actually spend

Brand names on a bit set matter less than the steel, heat treatment, and machining, but some cordless ecosystems do pair naturally with certain kits. A DeWalt drill bit set with a solid indexed case and S2 steel driver bits often matches well with a DeWalt 20V Max drill and impact driver combo, while a Ryobi kit might appeal on price for a landlord who already owns several Ryobi drills. Milwaukee, Makita, and Bosch all sell compact bit sets that favor quality over piece count, and those are the ones that usually survive in a light pro toolbox.

Price is where many buyers get trapped by the illusion of value, especially when a 200 piece kit on Amazon undercuts a 30 piece set from a pro brand at Acme Tools. That cheap Amazon bit set often hides soft carbon steel bits, poorly ground split point tips, and driver bits that are not truly impact rated, so the first real job exposes every weakness. When you compare that to a mid priced cobalt drill bit kit or a stainless steel compatible masonry set from a reputable brand, the cost per usable piece suddenly looks very different.

Buying strategy should be simple for a working DIYer or side gig contractor who wants the best drill bit set for cordless drill work without wasting money. Start with one compact twist drill bit set, one small cobalt piece set for metal, one carbide masonry trio, and one premium driver bit kit, then expand only when a specific job demands a new size or head style. Whether you buy from a local dealer, order online for convenience, or lean on a pro-focused retailer for support, focus on fewer bits, better steel, and cases that keep every shank and head exactly where you expect them.

FAQ

What is the best drill bit set for cordless drill work at home ?

For most homeowners, the best drill bit set for cordless drill work is a compact kit with 13 high speed steel twist drill bits from 2 mm to 10 mm, plus a small driver bit set in S2 steel. That combination covers pilot holes, clearance holes, and almost all screw driving tasks without needing a huge 200 piece set. Add three masonry bits and a few spade bits and you will handle nearly every common repair.

Do I really need cobalt drill bits for metal ?

Cobalt drill bits are not mandatory for thin mild steel, but they become essential when you drill stainless steel, hardened screws, or thicker structural steel. Standard high carbon steel or basic HSS bits dull quickly in those materials and start to smoke, which risks burning the workpiece and the bit. A small cobalt drill bit kit with six to eight sizes is usually enough for serious metal work around a property.

How do I know when to replace a drill bit or driver bit ?

Replace a drill bit when it starts drilling noticeably slower, produces smoke, or walks off center even with light pressure. Chipped cutting edges, a blue overheated tip, or a rounded hex shank are also clear signs that the bit has reached the end of its useful life. For driver bits, retire them when the head no longer fits snugly in the screw or when they start camming out under moderate torque.

Are impact rated bits really necessary for an impact driver ?

Impact rated bits are designed with tougher steel and a more flexible shank to survive the hammering action of an impact driver. Standard screwdriver bits can twist, snap, or shatter under those loads, which can damage the screw head and potentially injure the user. If you own an impact driver, always use impact rated driver bits and impact rated drill bits with a proper hex shank.

Is a 200 piece drill bit kit ever worth buying ?

A 200 piece drill bit kit can make sense for a beginner who wants a wide variety of sizes and head styles to experiment with, but most of the pieces will never see regular use. Working DIYers and light pros usually find that a focused 20 to 40 piece set with quality steel and a good case outperforms a giant kit full of duplicates. Over time, buying fewer high quality bits and replacing only the worn sizes gives better results and a lower real cost.

Quick comparison: compact cordless drill bit sets