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 Asst contains: 30 – 1/4″; 20 – 5/16″; 50 – 3/8″; 20 – 7/16″; 50 – 1/2″; 20 – 9/16″; 30 – 5/8″; 35 – 3/4″; 10 – 13/16″; 20 – 7/8″; 10 – 1″; and 5 – 1-1/4″.