Total length 55 - 69 mm, shank - 6 mm (1/4 "inch), tip outer diameter - 10 mm, tip blade length 8 - 25 mm High quality: Made of high quality heat treated tungsten carbide, ensuring its hardness can reach HRC70; Multipurpose tools: Perfect for detail work, widely used for metalworking, woodworking, model engineering, wood carving, jewelry making, welding, chamfering, casting, deburring, grinding, etc. Easy to use: Usually can be used with handheld electric or pneumatic tool drive (also can be used in machine tool and the speed of electric/pneumatic tools is usually about 6000-50000 rpm;