This Thin Nylock Nut Kit contains 105 pieces. These nylocks are grade 8 with a self locking nylon insert in the thread. They are designed to increase locking force and prevent the nut from coming loose.
Also known as nyloc nuts, there are several different sizes available in this kit. (30) 1/4", (25) 5/16", (20) 3/8", (15) 7/16", (15) 1/2". This kit is available with fine or coarse nylocs.