It's widely used in household DIY, auto parts, woodworking, professional machine repairing a professional contractor, etc. Six corners with groove design, can maximize to avoid the fastener scratch and wear in the using time. Universal 1/4 inch hex shanks fit quick-change/release and lock firmly in standard chucks, impact driver, drill driver and screwdriver. Universal 1/4 inch. hex shanks fit quick-change chucks and any drill, driver, or screwdriver. Strong inner hexagon sleeve (non magnetic). Applicable for installing in those hexagon tools, such as pneumatic screwdriver, electric screwdriver, pneumatic drill, electric drill, drill, manual screwdriver, etc. and hardened chrome vanadium steel, Corrosion-resistant sandblasted . Anti rust and anti slip. Set Includes: 9pcs. Power Nut Driver Bits (Metric): 5, 6, 7, 8, 9, 10, 11, 12, 13 mm. Complete with workbelt storage clip, easy to use and storage. Widely used in household DIY, auto parts, woodworking, professional machine repairing, etc. Color: Silver grey, black Materials: Chrome vanadium steel Package includes: 9 x Metric Nut Driver Bit Set Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.