Feature●Set of 6 1/4", 5/16", 1/2", 5/8", 13/16" (6.3mm to 20.5mm in metric) in one carton.●3 flutes for smooth and fast cutting RPA20233 2023Material HSS 4241 with coated ground precision drill for demanding drilling in metal and steel.●Smooth cutting and fine surface. For hand drilling and stationary drills. High Speed Steel (HSS) 4241 is a type of alloy steel containing high amounts of tungsten, chrome, vanadium. and has a higher concentration of cobalt than standard HSS. HSS 4241 countersinks are ideal for use in high temperature applications where other types of steel can deform or lose their hardness.●International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.Description