Flute length 3.1 inches; 135° split tip starts drilling immediately, eliminating "walking". Sold individually. 17/64 Inch, Cobalt Bit, 135 Degree Split Point for Minimizing Walking, 8% Cobalt for Higher Heat and Abrasion Resistance, Heavy Duty Web Construction for Strength and Durability, For Hard Metal Drilling Including Heavy Duty Abrasive, Alloy Metal Drilling on Hardened Steel, Cast Iron and Stainless Steel, Carded.