Specifications: * Brand new and high quality. * Material: 5% Cobalt M35 High Speed Steel. * Angle Point: 135 Degree. * Shank Type: Straight and Round Shank. * Specification Met: ANSI. * Hardness: 65-66 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. * Please check the detail information carefully before purchasing. * Please allow 1-2mm in size measurement chart for variance due to manual measurement. * Your satisfaction is our utmost concern, please feel free to contact us for any questions and concerns.Return and Feedback: * Return: Our 30-day Satisfaction Guarantee customers to return new and unused products in their original factory condition for any reason within 30 days from the date of purchase. * We appreciate your business and strive to improve our customer service and our commitment to quality. * If for some reason there is any issue with the purchase, please contact us prior to leaving feedback, and we will be glad to work with you to have it resolved.