About this itemUniversal Wrench: Different sizes meet your different needs, dual marked SAE and metric, fits standard 5/16 inch -7/8 inch/metric 8mm-22mm nuts and bolts.The wrench is also suitable for women.Double Head Design: There are two specification ranges for double-ended wrenches, the smaller end is suitable for nuts and bolts of 8mm to 13mm, and the larger end is suitable for nuts and bolts of 14-22mm. This special design greatly enhances the scope of application of the wrench and can meet your different needs.High Quality Materials: The materials of wrenches determine their durability. Our wrench head is made of High quality chrome vanadium steel, heat-treated for durability. Drop forged construction and corrosion-resistant black finish prolong the service life. The favourable surface finish causes less friction. It is very well constructed, sturdy and very reliable.Chrome Plated and Polished: The surface of the wrench is treated with overall heat treatment and polished plating, which has super high anti-corrosion and anti-rust properties. You can use it freely in any possible work and repair occasions.