Dual-Size Versatility: 10sets 1/2Inch + 10 Sets 3/8Inch Impact Wrench Retainer Rings & O-Ring, perfect for switching between tool sizes during automotive repairs, machinery maintenance, or DIY projects. Universal Compatibility: Designed for 1/2Inch & 3/8Inch square-drive impact wrenches, compatible with for and other Part Number-standard tools - no guesswork for sizing. High-Quality-Grade Durability: O-rings made of premium rubber a tight seal and prevent air/power leaks in pneumatic/electric tools. Tool-Free Installation: Slide the retaining ring into the anvil at a 45° angle, push to lock perpendicularly-replace worn parts in seconds and get back to work. Cost-Effective 10-Pack: Each kit contains 10 complete sets (ring + O-ring), offering extra backups to reduce downtime and save on repeat purchases. Please note: There may be slight color difference or discrepancy in the actual product, which does not affect the use, please don't mind, thank you! Colour:As Shown Material:rubber Package Contents: 10sets * 1/2Inch Impact Wrench Retainer Rings & O-Ring 10sets * 3/8Inch Impact Wrench Retainer Rings & O-Ring 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.