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Specifications: Material: 4241 HSS, Black Oxide Coating Angle Point: 135 Degree Flute Type: Spiral Shank Type: Straight Shank High-Speed Steel: High-speed steel construction provides ultimate durability, the cutting edge is hardened and honed for sharpness, chatter-free design with staggered cutting teeth ensure the precise countersinking and hole smooth clean. Twist Design: The split point tip and twist design increases cutting speed while easy self-centering prevents walking. Say bye to all those chips and particles, with the twist design the drill bit can quickly clear them out, and leaves a clean, smooth hole. Notice: Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.