31/64", Cobalt Drill Bit, With 3/8" Reduced Shank To Fit In All 3/8" Drills, 135 Degree Split Point To Minimize Walk, 8% Cobalt For Higher Heat & Abrasion Resistance, Heavy Duty Web Construction For Strength & Durability, For Tough Metal Drilling, Including Heavy Duty Abrasive, Alloy Metal Drilling On Hardened Steel, Cast Iron & Stainless Steel, Carded.