Similar to housing rings. These external rings accommodate components with large chamfers and radii. Handy kit for shop toolroom or toolbox. On hand when needed saves time and money. Plastic compartment box is easy to store. The Precision Brand 140-piece retaining ring Assortment contains: 20 each of 1/2 in, 9/16 in, 19/32 in and 5/8 in, 15 each of 11/16 in and 3/4 in and 10 each of 7/8 in, 1 and 1-1/4 in.