【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