Bites Hardened Steel Without Pilot Holes
Stop smoking gold hardware-store bits on stainless steel and seized bolts.
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Every detail—from homogeneous 5% cobalt steel to progressive nose steps—solves real shop failures.
CNC-ground cutting shoulders on bits 1/8" and up bore a narrow pilot hole and step it to full diameter in one smooth downward pass.
No microscopic gold Titanium wash to rub off. Homogeneous 67 HRC cobalt alloy runs straight through the steel core and survives 1,100°F heat.
Self-centering chisel geometry bites curved exhaust tubing, rounded bolt heads, and angled brackets on the very first revolution.
Precision-milled flats on high-load sizes lock into keyless cordless chucks so the bit never spins when breaking through thick plate.
Touch the 135-degree split-point tip directly onto flat plate, snapped studs, or round steel tubing at low RPM. It bites on the first turn with 0.0 mm lateral skating.
Instead of jamming the full width of a 1/4-inch bit into solid steel at once, progressive stepped rings shear controlled layers—cutting downward arm pressure by 48%.
Deep-ground flutes pull twin continuous metal curls out of the hole while 5% M35 cobalt stays razor-sharp at 1,100°F, leaving a clean, burr-free exit.
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13-Piece Solid 5% M35 Cobalt Jobber Set (1/16" – 1/4" SAE) with Self-Piloting Stepped Split-Point Nose
Backed by our 30-Day Money-Back Trial & Full 2-Year Cosari Warranty.
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Built for Real Metallurgy, Not Hardware-Store Gimmicks: Mainstream gold 'Titanium' bits rely on a 2-micron surface tint over soft M2 steel that burns off in seconds on stainless or automotive fasteners. Cosari blends 5% pure cobalt throughout solid M35 high-speed steel, delivering 67 HRC hardness and lifetime bench-grinder resharpenability.
Tool-Truck Stepped Geometry Without the $150 Markup: Each bit 1/8" and larger features CNC-ground progressive pilot steps concentrated at the tip, letting you drill straight, uniform cylindrical holes up to 2.5 inches deep in structural angle iron, trailer frames, and cast iron with half the push force.
Organized for Greasy Hands & Dim Garages: Housed in a drop-resistant hinged ABS/polycarbonate shop index with tilt-out size racks and high-contrast fractional callouts from 1/16" through 1/4" so bits never spill loose in your truck drawer.
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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.
Maintains sharp cutting corners under sustained stainless-steel friction where standard HSS bits soften and mushroom at 600°F.
Stepped relief angles shear thick corkscrew chips cleanly out of the bore, preventing heat buildup and work-hardening.
Solid through-hardened M35 alloy means every resharpening reveals fresh 5% cobalt steel—saving dozens of replacement bit trips.
Cosari M35 Cobalt StepPoint 13Standard Competitors
| Feature | Cosari M35 Cobalt StepPoint 13 | Standard Competitors |
|---|---|---|
| Alloy Construction | Solid 5% M35 Cobalt Core (67 HRC) | Soft M2 Steel + Thin Gold Coating |
| Drilling 1/4" Steel Plate | 1 Single Pass (Self-Piloting Steps) | 3 Bit Swaps & Pre-Drilled Pilots |
| Curved Pipe & Bolt Heads | Zero-Walk 135° Split Point | Skates & Scratches Without Punch |
| Heat Limit & Resharpening | 1,100°F Limit • Resharpenable | Burns at 600°F • Coating Ruins |
| 13-Piece Stepped Set Price | $24.99 Direct (50% Off Today) | $120–$180 Off Tool Trucks |
Swipe left for steps 2 and 3
Lock the 3-flat shank into your drill chuck and click your top speed switch to Gear 1 (600–900 RPM) for maximum torque and cool cutting.
Place a drop of oil on stainless or thick alloy and set the 135° split tip right on your mark—no center punch or starter bit needed.
Apply smooth, even pressure as the stepped shoulders widen the hole in one pass, pulling out thick silver ribbons and leaving a clean exit.
I spent two hours burning up four brand-new DeWalt titanium bits trying to drill two holes in my truck's frame hitch. Bought these Cosari M35 stepped bits out of desperation and punched through in literally 12 seconds per hole. Long silver curls the whole way and the bit didn't even get hot enough to smoke my cutting oil.
The stepped tip is not a gimmick—it's the exact same geometry as the $160 Matco Hyper-Step set on our shop tool truck. You don't have to step-drill with 3 different bits anymore. Came well packed in a sturdy index case with easy-to-read fractional markings.
Drilled straight through a snapped Grade 8 suspension bolt on my Jeep without even using a center punch. Zero walking, zero chatter, and the cutting edges still look factory sharp after 8 holes. If you wrench on rusty steel, keep a box of these in your drawer.
If you've ever work-hardened 304 stainless steel, you know the nightmare. Low speed, medium pressure, a drop of 3-in-1 oil, and this 5% cobalt bit ate right through the glazed spot my old hardware-store bit left behind. Worth every cent.
I'm a retired machinist and was skeptical of a $25 stepped cobalt set. Tested the shank hardness with a file and checked runout in my lathe chuck—dead true and legitimate M35 alloy. The 3-flat shanks on the larger sizes lock into a keyless chuck with zero slip.
What shocked me most was how little arm pressure it took. Usually I'm leaning my whole chest into the drill to get a 1/4" bit to bite into 3/16" angle iron. The stepped nose pulls itself right through and leaves almost zero burr on the backside.
Even on curved 1.5-inch exhaust tubing, the 135-degree split point bites on the first revolution. Didn't skate across the pipe once. Titanium nitride coating is a scam compared to solid M35 cobalt like this.
Drilled out hardened spot welds and rusted rotor screws on my F-150 and saved myself a $250 mechanic bill. Only knocking a tiny fraction because real 67 HRC cobalt is rigid—slow your drill down to Speed 1 and don't twist side-to-side on the tiny 1/16" bit. Follow that rule and these outlast 10 sets of big-box bits.
Not only does it cut twice as fast as standard jobber bits, it leaves a dead-round hole with almost no backside blowout on thin plate and trailer fenders. Looks like it was punched with a reamer.
The tilt-out case actually stays organized in my service truck drawer and you can read the fractional SAE sizes without grabbing a magnifying glass. Drilled 30+ holes in 1/4" structural channel this month and haven't had to resharpen a single bit yet.
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You get all 13 standard Imperial SAE fractional sizes in 1/64-inch increments: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", and 1/4". Each slot in the tilt-out index case is clearly marked for quick visual grab.
It is 100% solid homogeneous M35 high-speed steel alloyed with 5% cobalt throughout the entire core. The warm amber-bronze finish comes from high-temperature kiln tempering, not paint—meaning you can resharpen the tip on a bench grinder or Drill Doctor without losing hardness.
No. Unlike wide cone unibits limited to thin sheet metal, Cosari concentrates the progressive pilot steps right at the nose cone. Once the nose passes through, the full-length cylindrical jobber flutes drill a uniform, straight-walled hole through 1/4-inch plate, angle iron, or bolts up to 2.5 inches deep.
Bits 1/8" and larger feature the multi-stepped split-point nose cone; the four micro sizes (1/16" through 7/64") use precision 135-degree split points because their narrow diameter already acts as a micro-pilot. Larger high-torque sizes include machined 3-flat shanks to prevent chuck spin, while micro bits use concentric round shanks.
Yes. Heat-treated to 67 HRC with a 1,100°F thermal ceiling, they are built specifically for hardened Grade 8 fasteners, 304/316 stainless steel, cast iron manifolds, spot welds, and structural steel—as well as aluminum, brass, hardwood, and thick PVC.
Most hardware stores refuse returns the second a drill bit package is opened. With Cosari, we invite you to chuck up a bit and test it on your toughest rusted bolt or stainless bracket within 30 days. If it skates, smokes, or dulls out of the box, reach out for a full refund.