Bite Stainless Dead-Center. Every 0.1mm Size Included.
Stop smoking $10 hardware-store bits that skate across stainless steel and work-harden bolt holes.
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Every detail of the MetriCore 51—from the 0.1mm machinist progression to the stamped steel 3-tier rack—is built to cut hard metal without drama.
Never settle for a sloppy fractional approximation again. Pull the exact 2.5mm, 3.3mm, 4.2mm, or 5.0mm bit for M3–M6 taps, tight pin clearances, or smooth stepped pilot drilling.
Conventional 118-degree bits skate across stainless and glaze the surface in seconds. Our precision split point bites on contact so both cutting lips shear symmetrical silver chips.
High-speed steel twist flutes treated with a glossy bronze-gold oxide finish hold lubricant better, reduce galling in deep holes, and stay sharp across dozens of plate penetrations.
Housed in a rectangular light-grey painted metal box with a positive top clasp and three stepped, stamped-number tiers that keep all 51 bits standing at military attention.
Stainless steel only hardens when a dull bit rubs without cutting. The MetriCore split point engages the metal in the first revolution—even on curved tubing without a center punch—shearing clean spiral curls before heat can build.
Organized across three stepped metal rows (1.0–2.6mm front, 2.7–4.3mm middle, 4.4–6.0mm rear), you can step-up hole sizes gradually in thick steel plate or match metric and fractional fasteners to the tenth of a millimeter.
Unlike wobbly 1/4-inch hex adapters that snap under lateral load, every bit features a smooth cylindrical round straight shank that seats concentrically inside 3-jaw cordless chucks and drill presses.
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51-Piece 0.1mm Micro-Increment HSS Twist Drill Index (1.0mm–6.0mm) in Hinged Painted Steel Shop Case
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$49.99 $99.99 Free Tracked Shipping (5–7 Days) Included
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30-Day Money-Back Guarantee plus a full 2-Year Warranty.
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Built for Stainless, Alloy Steel & Seized Fasteners: Whether you are drilling 304 stainless exhaust brackets, marine hardware, 3/16-inch structural frame plate, or drilling out a snapped Grade-8 bolt, the Cosari MetriCore 51 delivers crisp, predictable chip evacuation at low RPM.
Quick Metric-to-Tap & Imperial Reference: Covers exact pre-drill sizes for M2 (1.6mm), M2.5 (2.0mm), M3 (2.5mm), M4 (3.3mm), M5 (4.2mm), M6 (5.0mm), and M7 (6.0mm) threads, while matching 1/16" (1.6mm), 3/32" (2.4mm), 1/8" (3.2mm), 5/32" (4.0mm), and 3/16" (4.8mm) imperial hardware.
Workshop-Grade Metal Storage Architecture: No more cracked plastic cases or unreadable stickers. The light-grey painted stamped steel box latches shut with a top metal clasp and organizes all 51 bits upright in three clearly stamped tiers.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Standard 14-piece and 21-piece fractional sets leave wide gaps that ruin thread engagement and force sloppy bolt fits. With 51 continuous 0.1mm steps, the exact cutter you need is always waiting in the rack.
During bench testing, a single MetriCore bit bored 88 straight holes through 3/16-inch steel plate without losing its keen cutting lip—saving you repeated $10 trips to the hardware store.
Industrial 50-piece metric indexes routinely cost $110 to $165 from specialty machine-supply catalogs. Our direct-to-shop $49.99 price delivers all 51 bits plus the steel index box for 98 cents a bit.
Cosari MetriCore 51Standard Competitors
| Feature | Cosari MetriCore 51 | Standard Competitors |
|---|---|---|
| Included Bit Count & Increments | 51 Bits (1.0–6.0mm in exact 0.1mm steps) | 14 to 21 fractional bits with wide size gaps |
| Behavior on Unpunched 304 Stainless | Bites dead-center with zero lateral walk | Skates sideways & work-hardens the surface |
| Storage Case Construction | Painted steel hinged box + 3-tier upright rack | Brittle plastic clamshell requiring pliers |
| Metric Tap Hole Readiness (M2–M7) | 100% exact tenth-of-a-mm tap pre-drills | Sloppy fractional approximations |
| Cost Per Precision Bit | $0.98 per bit ($49.99 complete set) | $2.60–$3.80 per bit ($55–$110 sets) |
Swipe left for steps 2 and 3
Flip open the top clasp on the light-grey steel case and pull the exact tenth-of-a-millimeter bit you need from the three clearly numbered upright tiers.
Seat the smooth round straight shank dead-center inside your 3-jaw drill chuck, tighten firmly by hand, and switch your drill to low gear (600–900 RPM).
Add a drop of cutting oil and apply steady downward pressure—watch the split point bite without walking as two clean silver spirals ride up the bronze-gold flutes.
Probably the nicest drill bit set I've used. The split points bite cleanly into metal without walking, even when I skip the center punch. They cut smoothly and feel much more precise than my old shop bits.
I was tired of burning through cheap hardware-store bits on tough steel. This 51-piece HSS set has held up much better, and having every size from 1.0mm to 6.0mm in 0.1mm steps is extremely useful.
Excellent value for something my shop genuinely needed. The painted grey metal case feels sturdy, the hinged lid closes securely, and the three labeled tiers make it easy to grab the right metric size without digging around.
I've only used the 3.2mm bit so far, but it went through hardened steel bolts almost like a hot knife through butter. Used cutting oil and steady pressure, and the hole came out clean. Very pleased so far.
I drilled 88 holes through 3/16-inch plate steel with one of these, and the bronze-gold HSS cutting edge felt just as sharp at the end. I've tried plenty of other bits, and this set made the job noticeably easier.
We build trucks and repair compactors, so these bits get regular metalworking abuse. They've held up well, and having every 0.1mm size standing upright in the labeled metal case saves time during fabrication and repair work.
Great set, solid quality, and they actually work on tough materials. I've used them on steel, hardwood, and thick plastic with clean results. The wide range of metric sizes is handy for both repairs and small projects.
Fabulous drill bits at a very good price. Getting all 51 metric HSS sizes in a proper labeled metal index box makes this a much better value than buying individual bits as I need them.
Helpful tip for cordless drill users: keep a steady hand with the 1.0mm to 2.0mm bits in the front row. Those thin HSS bits cut well, but side pressure in metal can snap them. Let the bit do the work.
It's an affordable imported set without fancy branding, but the bronze-gold grinding looks clean overall. I noticed tiny cosmetic variation at a couple tips, yet having exact 0.1mm steps for tap holes is far more important to me.
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You get 51 individual metric high-speed steel twist bits spanning 1.0mm to 6.0mm in uninterrupted 0.1mm increments (1.0, 1.1, 1.2, 1.3 ... all the way to 6.0mm). Not a single tenth-of-a-millimeter size is skipped.
Yes. Each bit is precision-ground from high-speed steel (HSS) with a glossy bronze-gold oxide finish and self-centering split-point geometry. Run your drill at low RPM (600–900 RPM) with firm feed pressure and a drop of cutting oil to peel clean silver curls without work-hardening the steel.
All 51 bits feature machinist-style smooth cylindrical round straight shanks for true concentric alignment in 3-jaw cordless drill chucks and drill presses. Simply tighten your keyless chuck firmly around the shank before drilling.
It is a heavy-duty rectangular light-grey painted steel hinged case with a positive top metal clasp. Inside, a three-tiered labeled holder keeps all 51 bits standing upright by size (1.0–2.6mm front, 2.7–4.3mm middle, 4.4–6.0mm back).
Absolutely. Because the set moves in tiny 0.1mm (0.0039-inch) steps, it hits standard fractional sizes dead-on—including 1/16" (1.6mm), 3/32" (2.4mm), 1/8" (3.2mm), 5/32" (4.0mm), 3/16" (4.8mm), and 7/32" (5.6mm)—plus every tight-clearance or step-drill size in between.
Put the Cosari MetriCore 51 to work in your own garage for 30 full days. If the bits walk, skate, or fail to out-perform big-box sets costing twice as much, contact our support team for a 100% refund—plus you're covered by our 2-Year Workshop Warranty.