Feature    Perfect Application The O ring & C ring is well-designed by us and the size is 3/8 inch. Fits for Milwaukee Brushless Impact Wrench.    Package Included 3/8 Inch Impact Wrench Socket Retainer C-ring with O-Ring—3 PCS; Retaining Ring Installation Tool—1PC.    Superior Material C-clip rings--Made from high quality heat-treating steel, extending using time; O-Rings & Installation tool—Made from melting rubber and the size is measured meticulously by our machines according to the Milwaukee Brushless Impact Wrench.  .