[Package Includes]: 6 Sets 1/2Inch + 6 Sets 3/8Inch Impact Wrench Retainer Rings / Friction Rings & O-ring + Anvil Tool [Compatible with]: 1/2Inch Standard for Type Impact Wrench, Meet Part Number Standard; 3/8Inch Standard for Type Impact Wrench, Meet Part Number Standard. [Suitable for]: 1/2Inch and 3/8Inch Square Drive Electric Wrench and Pneumatic Wrench are Suitable for This Kit [Specifications]: Size: about 1/2 inch and 3/8 inch [Install & Use]: How to Install New O-Ring: Place Retaining Ring Into Install Tool Recess, Insert Anvil Into Retaining Ring at a 45 Push and Bring the Anvil Perpendicular. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:As Shown Material:Rubber+Iron Package Contents: 1 * Impact Retaining Ring Clip Friction Ring kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.