【Combination include】: 1/2" & 3/8" Size Retaining Rings, fit for Most Standard Milwaukee Type Impact Electric/Pneumatic Wrench 【Suitable for 】: 1/2" Square Drive Electric Wrench and Pneumatic Wrench are Suitable for This Kit 【Suitable for 】: 1/2" Standard Milwaukee Type Impact Wrench, Meet-OEM Standard 【Suitable for】 :3/8" Standard Milwaukee Type Impact Wrench, meet-oem standard 【Suitable for】: 3/8" Square Drive Electric Wrench and Pneumatic Wrench are Suitable for This Kit 【Easy Installation】:The Install Tool Got Two Hole For Different Size Retainer Rings, You Just Place Retaining Ring Into Install Tool Recess, Insert Anvil Into Retaining Ring At A 45°Push And Bring The Anvil Perpendicular. 【Tip】:Does not fit DeWalt or other cordless tools. 【DIY TOOL】:3/8“ & 1/2" Impact Wrench Retaining Ring allow you to switch binding requirements at will, making your DIY life more convenient 【High quality materials】:The O-ring is made of high-quality rub ber, which is reliable and not easy to break 【High quality materials】:The snap ring is made of carbon steel, which is sturdy and durable, wear-resistant, and has a long use time