General description This 9 Pack of 5 to 13mm Imperial Socket Drill Bits with Impact Nut is made of durable chrome vanadium steel, ensuring long life and reliability during use. The solid inner hex socket design allows for a secure fit without the need for magnets. This versatile set is suitable for various applications including household DIY, woodworking, auto parts, and professional machine repair. Technical specifications Material: chrome vanadium steel Surface finish: electroplating, blackening Hardness: 45 ± 2 (HRC) Sizes: 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm Adapters: 1/2 (M) - 3/8 (F), 3/8 (M) - 1/4 (F), 3/8 (M) - 1/2 (F), 1/4 (M) - 3/8 (F) Compatibility and accessories Fits most corded or cordless drills for hex head screws Includes a set of 4pcs reduction and boost adapters Other information Black oxide finish for corrosion resistance Spring loaded ball stop keeps bushings fixed and secure