The round rings provide good sealing effectively air leakage and leakage, ensuring work Compatible for type 3/8inch impacts wrench, ensuring a perfectly fit and improving tool Contains 1 tool, 3Round Rings and 3ring clamps, enough for daily replacement This rings is craft from rubber materials to ensures long-terms reliability and durability The size of the Round Rings is 0.32x0.05inches, the size of the split clamps is 0.4x0.08inches, and the size of the tool is 1.37x0.4inches. Please check the size carefully, Manufacturer: BULAIDAI