Compatible-2-5mm, 5-10mm, 10-15mm, 15-20mm 90 degrees-wear-resistant and durable, high chamfering concentricity, beautiful chamfering, etc. High-speed steel 4241-high hardness and wear resistance, high cutting speed, sharp cutting edge. Suitable for materials with hardness less than 28° Angle design-rust and corrosion resistance. With the increase of cutting edge strength and sharpness, the use of large core diameters, tool rigidity, countersink cutting and cutting capabilities have been improved There are white diamonds and titanium plating options Specification: 2-5 (the hole in the range of 2MM--5MM, the handle is 6MM, the diameter of the head is 9.7MM) 5-10 (the hole in the range of 5--10MM, the handle is 8MM, the diameter of the head is 14MM) 10-15 (the hole in the range of 10MM-15MM, the handle is 10MM, the diameter of the head is 21MM) 15-20 (pour the hole in the range of 15MM-20MM, the handle is 12MM, the diameter of the head is 28MM) Weight: 0.18kg Shank diameter: 6/8/10/12mm Full length: 45/49/66/85mm