10 sets of 1/2" impact wrench socket retainer rings with o-ring,impact wrench tool parts and accessories,impact friction ring,hog ring,o-ring square drive socket retainer ring palart this kit will fit most major brands of electric and pneumatic wrenches with 1⁄2” square drive.<br> ir, snap-on, chicago pneumatic, florida pneumatics, air cat..<br> replaces your worn out retainer ring and o-ring