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,