This is a hex bit socket set, suitable for hand drills, cordless drills, pneumatic screwdrivers, and can be used to screw hexagon screws and tighten nuts. Features: 1. Bit socket set: Bit socket set includes 5.5-19mm bit socket, which can meet your various needs. 2. Material: Made of chrome vanadium steel with higher impact resistance and hardness, providing wear resistance, oxidation resistance and corrosion resistance. 3. Efficient operation: the bit socket set has high precision, which can effectively help you to tighten the hexagon screws and tighten the nuts. 4. Convenience: Comes with a carrying case for easy storage and organization, keeping your hex bit socket set clean and tidy. 5. Applicability: This hex bit socket set is widely applicable, suitable for hand drill, rechargeable drill, pneumatic screwdriver. Note: 1. Due to manual measurement, the size may be slightly different. Thank you for your understanding. 2. Due to different light conditions and different monitors, item color displayed in photos may be showing slightly different from real object. Specifications: Color: Silver Material: Chrome Vanadium Steel Inner Depth: 34mm Total Length: 80mm Carrying Case Size: 23*18*4.5cm / 9.06*7.09*1.77in (L*W*H) Packing Size: 23*18*4.5cm / 9.06*7.09*1.77in (L*W*H) Net Weight: 1300g / 45.86oz Gross Weight: 1300g / 45.86oz Package List: 15 * Bit Socket 1 * Carrying Case