Blolacdz (5+5Sets) 3/8" And 1/2" Impact Retaining Ring Clip With O-Ring For [ Package Includes ] : 5 Sets 3/8" + 5 Sets 1/2"Impact Wrench Retainer Rings O-ring + Anvil Tool [ Suitable for ]: 3/8"and 1/2" Square Drive Electric Wrench and Pneumatic Wrench are Suitable for This Kit [ Compatible with ]: 3/8" Standard Milwaukee Type Impact Wrench, Meet-OEM Standard, 1/2" Standard Milwaukee Type Impact Wrench, Meet-OEM Standard. [ Specifications ]: Size: about 3/8 inch and 1/2 inch; Color: Black; Material: Carbon Steel, Rubber Installation: Put the fixing ring into the groove of the installation tool; Insert the anvil into the retainer with 45 thrust and make the anvil vertical. The o-ring is made of high-quality rubber, which is not easy to break; the fixed ring is made of carbon steel, which is strong and wear-resistant.Anvil installation, easy to install quickly, can reduce downtime. It is an indispensable tool accessory on the fixed equipment.