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Specifications: Brand new and high quality. Material: M2 High Speed Steel, Bright Finish. Point Angle: 135 Degree. Flute Type: Spiral. Shank Type: Straight and Round Shank. Specification Met: ANSI. Indentation Hardness: 63-63 Rockwell. 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 clears 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. Not For Use On Concrete, Masonry, Stainless Steel. Please check the detail information carefully before purchasing. Please allow 1-2mm in size measurement chart for variance due to manual measurement. Please excuse us from any possible typos and unintentional misinterpretations Your satisfaction is our utmost concern, please feel free to contact us for any questions and concerns. Our Services: On-time Delivery: Your product will arrive at the scheduled time. Our working time: Monday to Friday, 9:00~18:00. For inquires and customer support, please send your email via amazon email system. All emails will be responded to within 24 hours during business days.