Multi-function wrench: The different sizes of the universal wrench can meet your different needs. The universal wrench is suitable for standard nuts from 5/16" to 7/8/8" and from 8mm to 22mm. Applicable to a variety of screws, nuts: the automatic tightening wrench is suitable for a variety of screws, nuts disassembly or maintenance, smooth opening, protect screws and nuts Application: Nut repair wrenches are suitable for home, mechanical engineering, machinery repair, auto repair and other related maintenance industries Material: The multi-functional wrench uses high quality CR-V forged steel, high hardness, super durable Durable: heat treatment and polishing of the wrench double-end of the wrench, the surface spray, anti-corrosion rust