Double-ended self-tightening multifunctional wrench. Time saving, efficient, convenient, industrial quality. The whole is polished and electroplated, beautiful and not easy to rust. Suitable for removing screws of various specifications. Uses: Widely used in mechanical engineering, mechanical maintenance, automobile maintenance and other related maintenance industries.Specification: Size: 8-22mm/0.31-0.87in Material: chrome vanadium steel Length: Small: 22cm/8.66in Fit for:Standard 5/16 inch to 7/8 inch and metric 8mm to 22mm nuts and bolts. Package Included 12 x Double-Ended Wrench Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.