Irwin 3018002 29-Piece M35 Cobalt Drill Bit Index Set (1/16" to 1/2") The Irwin 3018002 29-piece cobalt alloy steel drill bit set bores clean, precise holes through hardened stainless steel, cast iron, high-alloy steel, titanium, and abrasive structural metals where conventional high-speed steel bits overheat. Engineered from premium M35 grade 5% cobalt alloy steel, these high-durability twist drills maintain exceptional cutting edge hardness and thermal resistance under severe rotational friction. Featuring 135-degree split points that start cutting immediately on contact without center punching or walking, 3/8-inch reduced shanks on larger diameters, and a heavy-duty rubber-armored metal index case with removable cartridges, it equips industrial millwrights, machinists, and fabricators with comprehensive hole-making capabilities. Best Used For: Hardened Stainless Steel and Titanium Fabrication: Drilling structural pass-throughs and mounting holes in 304/316 stainless plates, marine hardware, and high-temp alloy sheet. Heavy Machinery and Truck Frame Maintenance: Boring clean holes through heat-treated vehicle chassis channels, suspension brackets, and ductile cast iron housings. Precision Tap-Drill Hole Preparation: Sizing accurate pilot holes in exact 1/64-inch increments for thread tapping and fastener threading using the integrated index chart. Key Performance & Safety Features Premium M35 Cobalt Alloy Core: Infused with heavy-duty cobalt steel formulation to resist thermal friction breakdown and retain edge sharpness in abrasive alloys. Self-Centering 135-Degree Split Point: Begins cutting immediately on smooth metal surfaces, eliminating drill bit wandering and reducing required feed pressure. Exhaustive 29-Piece Fractional Range: Delivers complete workshop coverage from 1/16" to 1/2" in precise 1/64" increments for exact hole dimensioning. Universal 3/8-Inch Reduced Shanks: Bits exceeding 3/8" feature stepped-down shanks to chuck securely into standard 3/8" and 1/2" portable drills or drill presses. Rubber-Armored Metal Index Case: Foldable metal storage box features a shock-absorbing molded rubber overmold and removable bit cartridges for jobsite protection. Integrated Tap & Die Reference Guide: Built-in sizing chart provides quick visual matching of drill bit sizes to standard tap and die pairings. What's Included (29) Irwin M35 Cobalt Alloy Steel Drill Bits (1/16" to 1/2" in 1/64" Increments) (1) Heavy-Duty Metal Storage Index Case with Protective Rubber Shell (2) Removable Quick-Access Twist Drill Bit Cartridges (1) Integrated Tap, Die, and Drill Bit Selection Reference Chart Technical Specifications Manufacturer Irwin Industrial Tools Model Part Number 3018002 Drill Bit Core Material M35 Cobalt High-Speed Alloy Steel (5% Cobalt) Drill Point Angle Geometry 135-Degree Self-Centering Split Point Total Piece Kit Count 29 Individual Drill Bits Diameter Range Coverage 0.0625 in. to 0.5000 in. (1/16" to 1/2") Sizing Step Progression 1/64-Inch Increments (0.0156 in. Steps) Shank Pattern Style Straight Shank (Reduced 3/8" Shank on Bits > 3/8") Index Case Housing Heavy-Duty Metal with Impact-Resistant Rubber Overmold Total Kit Freight Weight 4.75 lbs (76.00 oz / 2.15 kg) Universal Product Code (UPC) 024721065131 Warranty Coverage Manufacturer Limited Lifetime Warranty Suitable for material type Stainless Steel, High-Alloy Steel, Cast Iron, & Titanium Pro-Tip: When boring through thick stainless steel or high-nickel alloys with larger M35 bits, reduce your drill spindle RPM, apply steady feed pressure, and use a dedicated cutting fluid; this cools the cutting edge and prevents work-hardening of the metal substrate.
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