External, spring steel snap ring. Used to retain pulleys, gears or wheels on shafts. 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 300-piece snap ring Assortment contains: (30) 1/4 in, (20) 5/16 in, (50) 3/8 in, (20) 7/16 in, (50) 1/2 in, (20) 9/16 in, (30) 5/8 in, (35) 3/4 in, (10) 13/16 in, (20) 7/8 in, (10) 1 in and (5) 1-1/4 in.