225pcs O-RING box, from 3 to 22mm. This set of Oring´s consists of: 18 of the most used ring sizes, to accommodate a variety of tasks. Nitrile rubber rings resist oil, heat, silicone fluids and solvents. The rings are organized in a pvc box, conveniently stored, with a sizing guide for easy identification of the desired size. A large set of oring´s for home use, car mechanics and general mechanics.