DescriptionUniversal double ended wrench, double-headed self-tightening wrench, universal spanner 8-22mm key set screw nuts wrenches repair, double headed wrench for home work maintenanc. Applicable to mechanical engineering, machine repair, auto repair and other related maintenance industries.Features- Material: Chromes vanadium steel. - The wrench is made of high-quality chrome-vanadium steel forged steel with high hardness and super durability. - It could stand usage and work of much more years. It wont be easy to get rust and stained. - This firm wrench could ensure its great performance for long time. - With overall heat treatment and polishing plating treatment, this surface-spraying wrench is quite anti-corrosion and anti-rust. - You could freely use it at any possible working and repairing occasion.