Features TOOL STEEL 40CR: Made of high quality tool steel 40CR material, the surface is sandblasted, strong rust resistant, corrosion resistant EXTENDED LIFE: This is socket adapter, which adopt high temperature hardened, increases the durability and longevity SHANK DESIGN: The is socket adapter, which has hex shank design, 1/4in shank fits most electric corded or cordless drills SIMPLE INSTALLATION: This socket adapter is easy to install and remove, and which is not easy to drop during use WIDE APPLICATION: Suitable for home DIY, woodworking, auto parts, professional machine repair, etc. Widely used in hex tools, such as pneumatic screwdrivers, electric screwdrivers, electric drills, manual screwdrivers, etc. Specification: Item Type: Power Nut Driver Drill Set Shank Shape: 1/4in Hex Material: Tool Steel 40CR Specifications: 3/16(4.76mm), 1/4(6.35mm), 9/32(7.14mm), 5/16(7.93mm), 11/32(8.73mm), 3/8(9.53mm), 7/16(11.11mm) 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 12mm Size: Total Length: 38mm / 1.50in, Blade Length: Approx. 12mm / 0.47in, Inner Hole Depth: Approx. 6mm / 0.24in, Shank Length: Approx. 20mm / 0.80in packing list: 1 x Power Nut Driver Drill Set Package List 1 x Power Nut Driver Drill Set