Size - head size: PH0 (#0); total length: 50mm / 2inch; hex shank size: 1/4inch; rod diameter: 3mm / 0.12inch. Material - The screwdriver bits are made of specially heat-treated S2 steel, which offers high strength and hardness (HRC 60-61). They are , anti-bending, and sandblasted to enhance grip, durability, and resistance, while providing a matte, non-reflective finish. Features - Designed with magnetism can stably absorb the screws vertically or tilted and easily fix the screws, especially in a small space, which can more convenient to complete the work. Precision CNC machined head, precise appearance, reduces head wear during high-intensity tightening operations. Applications - tip screwdriver bit can easily screw into wood, metal and other materials. Screws can be tightened precisely without damaging the screws and screwdriver heads. 1/4inch hex shank driver bits can be used with electric screwdrivers, manual screwdrivers, electric drills, etc. for electrical work, mechanical repair work, and furniture installation. Notes-Before operation,make sure the screwdriver bit is firmly inserted into the power tool chuck.Avoid excessive force when tightening the screw to prevent the bit from being damaged or slipping out.Adjust power tool speed and torque settings according to the material being processed. Color: Silver Material: Steel Package Contents: 8 * Screwdriver Bit 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.