Details:* Manual and stationary use (in drilling machine).* 135 degree parting point tip.* HSS-Co drill bit set for high strength steels such as stainless steel.* Suitable for: aluminum, wood, malleable and deep drilling of iron positioning holes.* Difficult to machine the workpiece can be processed from stainless steel, tool steel, through heat treatment, * M35 cobalt high-speed steel to achieve high hardness, high wear resistance and high strength.* Cobalt alloy to improve heat resistance, which will make and survive normal HSS bits, especially if your job requires drilling hard metals.* Radial drill, bench drill or drill chuck can be used to drill.* Material: hss-co M35 Cobalt * Size: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0mm (Approx.)* Quantity: 19 PiecesPackage Contents:19 * Drill Bits:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.