Description of Utoolmart 7 3Mm Twist HSS 4241 Aluminum
【Dimension】- Bit Diameter: 7.3mm / 0.29-inch; Shank Diameter: 7.3mm / 0.29-inch; Hardness (HRC): 62-63. 【Material】- Twist Drill is made of high speed steel, high speed steel construction is designed for durability and extended tool life. 【Feature】 - Nitrogen Oxidation and Heat Treatment can increase the hardness and corrosion resistant of twist drill bit. 【Application】- Perfect for stainless steel, copper, aluminum alloy, as well suit for wood, plastic. 【Special Design】- Fully ground spiral groove design clears particles quickly,decreases friction and heat for faster drilling performance.