This double- headed wrench can hold standard 5/16-7/8 or 8-22 mm screws and nuts. Suitable for disassembly of screws of different specifications. Different sizes meet your different maintenance requirements. It is made of high-quality chrome vanadium steel material, high hardness, rust protection, comprehensive heat treatment. It has long service life and the key is not easy to break by tightening and rotating nuts and screws. It extra long design provides extra leverage that is easier and more labor-saving than other sockets on the market. Two different colors make your different choices. It is suitable for various maintenance-related industries, such as factory, automotive, machinery, bicycle, motorcycle maintenance, etc. This is the best gift for craft lovers.