Premium Materials: PH2 screwdriver bits set are made of industrial grade alloy steel for hardness enhancement, with sanded nickel treatment to enhanced oxidation resistance, and rust prevention. High Torque Bits: High torque and slim waist design, high impact resistance, which helps to absorb the high torque of the impact driver, prevents distortion and breakage to extend service life. Hex Shank with Double Slot Design: Quick change for 1/4 hex drive, with Double slot drill bit fit for range of tools, such as impact drivers, electric portable drill, electric drill, electric screw driver, hand screwdrivers, etc... Anti-Slip Precision Design: The screwdriver drill bit head is serrated to prevent slipping and breaking, absorbs the screws tightly. Perfect for furniture assembly, home DIY, woodworking, machinery, motorcycles, bicycles, electronic equipment, and auto repair. Color:As Shown Material:Steel Package Contents: 6 * anti-slip bit(25+50+65+70+90+150) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.