High Quality: The material is forged from high hardness alloy steel, with high hardness and high torque after quenching and high temperature heat treatment. 6.35mm hex shank: The sleeve uses a universal 6.35mm hex shank for most quick-change chucks, various flashlights and screwdrivers. Quick-change 6.35mm hex shank nut inserts securely into drivers for immediate use Wide Application: They are very suitable for any electric drill, screwdriver, impact drill, 3D printer, suitable for small residential projects and mechanical maintenance. Package Included: This metric impact magnetic nut driver set includes 4, 5, 6, 8, 10, 12, 14 and 16mm screwdrivers. 8 pieces of full metric sizes for many applications. The nut driver bit set is very suitable for any electric drill, screwdriver, impact drill, 3D printer, suitable for small residential projects and mechanical maintenance. Features: Material: alloy steel. Contents: 8 pieces. Impact Magnetic Metric Nut Drivers 6.35mm hex shank. Sizes: 4mm,