The sealing rings designed for the special requirements of pneumatic wrenches ensures smooth flows and none leakage Widely used in various fields such as automotive repair, mechanical manufacturing, and construction, it helps users achieve efficient and stable work Whether in high-intensity industrial environments or daily maintenance, it can effectively maintain stable air pressure and improve tool It is make of synthetic rubber, with good elasticity, and will not deform even after long term use Suitable for various pneumatic wrenches, intakes valves, and top rods, available in two specifications of 17mm and 20mm, Manufacturer: AMISENK