Description: Drill bit made with high speed steel coated with titanium nitrate for longer life. Reliable HSS drill with constant spiral hardness Shank: Hex Shank Use For: Steel, Plastic, Wood, etc Use With: Cordless Screwdrivers (Not included) Specification: Material: HSS Shank Diameter: Approx. 6.35mm (1/4'') Length: Approx. 5.5-11cm/ 2.1-4.3'' Size: Approx. 1.5mm/ 0.06'', 2.0mm/ 0.08'', 2.5mm/ 0.10'', 3.0mm/ 0.12'', 3.2mm/ 0.13'', 3.5mm/ 0.14'', 4.0mm/ 0.16'', 4.5mm/ 0.18'', 4.8mm/ 0.19'', 5.0mm/ 0.20'', 5.5mm/ 0.22'', 6.0mm/ 0.24'', 6.5mm/ 0.26'' Color: We have two kinds of products as shown in the picture. The only difference is color. We will send it at random. Your understanding will be much appreciated. Package Includes: 1 Set of 13 Pieces Drill Bits Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.