High-Quality Tungsten Carbide Cutter: Carbide Tipped Annular Cutter cuts up to 10x faster than standard drill bits and up to 3x faster than High Speed Steel. Ideal For Drilling Hard Materials: Hardened Steel, Stainless Steel, INOX, hardox, rail. Including metal with rust, Paint/Coatings, and corrosion. Burr Free Finish: Faster drilling and less finishing required. Bits perfect for speed-drilling and bolt-drilling. Weldon Shank Standard (2 Flat): Fits most magnetic base drills & drill presses, TCT slugger bits up to 3" diameter fit 3/4" weldon chucks (industry standard) (3-1/16" dia. & above fit standard 1-1/4" weldon chucks) 1" Diameter, 3" Depth of Cut - Pilot pin included up to 4" depth. (Not included on 6" depth & over mag drill bits) TCT Hornet Cutters available in up to 6" dia. & 10" depth.