McMaster 93088A120 Stretch-Fit One-Piece Socket Retaining Ring for 3/4" Square Drive, 2" to 2-1/4" ID

Stock fewer sizes of retaining rings—these stretch to fit a range of socket diameters. They have a retaining pin to secure your impact sockets and adapters to a tool that has a hole- or ring-and-hole-style retainer. A crush gauge on the pin deforms when the socket becomes worn and needs to be replaced. You can reuse these rings, but only on the same size or larger socket.