135° Degree Split-Point for fast penetration and accurate starting without center-punch. Special Hi-Molybdenum tool steel One piece solid construction 1/2" reduced shank for easier fit in drills. Type 280-UB 1/2" Reduced shank Ultra Bor Super Premium Heavy Duty shank with 3 flats on shank. 135° split-point. Special Hi-Molybdenum tool steel. One piece solid construction. Reccommended for use in work hardening grades of stainless steel and other hard metal drilling applications. Body & clearance are gold surface treated for maximum 1/2 lubricity.