[20PCS SAE and Metric] 10 PCS inch：5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2; 10PCS Metric: 4mm,5 mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm.[High Hardness] The material is forged from high-hardness chrome vanadium steel, with high hardness and high torque after overall high-temperature quenching and heat treatment. And the surface also has undergone corrosion-resistant sandblasting.[1/4 "Hex Shank] Quick-change chucks and any drill or driver, electric screwdriver, socket wrench, pneumatic impact wrench, rechargeable drill, screwgun and so on.[Wide Application] It is widely used in electric drills, screwdrivers, impact drills, household DIY, auto parts, woodworking, professional machinery maintenance and other fields.[Convenient Storage] Nut driver bit set come with a storage organizer to keep the pieces together, easier for carrying and organized storage and easily notice when one piece is missing. Specification: Quick-change chucksand any drill or driver, electric screwdriver, socket wrench, pneumatic impactwrench, rechargeable drill, screwgun and so on. Shank Diameter:1/4 inch (6.35mm) Power Nut DriverBits (Standard): 1/2, 7/16, 3/8, 11/32, 5/16, 9/32, 1/4, 7/32, 3/16, 5/32 inch; Power Nut DriverBits (Metric): 12mm, 11mm, 10mm, 9mm, 8mm, 7mm, 6mm, 5.5mm, 5mm, 4mm.