MATERIAL: The valve stem torque plugs are made of brass with a chrome finish for durability. There is also a silver colored loop for extra control. EASY TO USE: Press the pliers down and push the tapered washer into the stem until it is tight. Check for tightness and then loosen the lever connection. APPLICATIONS: Automotive valve stem cap seals are suitable for cars, vans, trucks, etc. They are mainly used in air pumps, 4S workshops, tire repair shops, garages and industrial air systems. Note: The data is all manually measured, please allow 1-3cm error, due to differences in light and display, there may be color difference, please refer to the actual item received.