These are forged and hardened chrome vanadium steel with a corrosion resistant sandblasted finish. These bits are made to last! This set of bits features a full range of SAE and Metric sizes. The universal 1/4" hex shanks fit quick change chucks and any drill, driver, or screw gun! The compact storage clip keeps your bits handy and has a wide belt clip so you can carry them with you on the job! Features: 1. Heat treated chrome vanadium steel, Anti rust, anti slip, flexible. 2. Anti rust, anti slip, flexible. Mounted on a black clip, easy to use and storage. 3. Applicable for installing in those hexagon tools, such as pneumatic screwdriver, electric screwdriver, pneumatic drill, electric drill, manual screwdriver, etc. 4. It's widely used in household DIY, auto parts, woodworking, professional machine repairing, etc. Package Include: 7 pc. Power Nut Driver Bits SAE: 3/16" - 1/4" - 9/32" - 5/16" - 11/32" - 3/8" - 7/16" 7 pc. Power Nut Driver Bits Metric:5 - 5.5 - 6 - 7 - 8 - 10 - 12mm