Don't get caught missing a nut or washer when you need one the most. This kit includes a wide variety of steel nylock nuts and steel AN washers so you're always prepared to put your ride back together and rest easy that everything will stay in place. The thin nylock nuts have a self-locking nylon insert in the thread. They are designed to increase locking force and prevent the nut from coming loose. Also included is a portable small parts organizer to keep everything right where you want it and easily accessible. Keep this kit handy so you're never stuck missing the nut or washer that you need! Kit includes: Fine Thread Thin Nylock Nuts (50) 1/4"-28 (50) 5/16"-24 (50) 3/8"-24 (50) 7/16"-20 (50) 1/2"-20. Steel Washers (50) 1/4" AN4 (50) 5/16" AN5 (50) 3/8" AN6 (50) 7/16" AN7 (50) 1/2" AN8. Titan Tools 11-Bin Small Parts Organizer Transparent quick-view top Dual top locks Built-in handle (7) Medium Bins: 3-1/8 x 2-1/8 x 1-7/8 inches (4) Small Bins: 2-1/8 x 1-1/2 x 1-7/8 inches Made of durable polypropylene.