Tuerca Nyloc 20MM 20 rosca métrica chapada en zinc para tornillo de juego y perno hexagonal M20 9006772
Nylon insert nuts made by DYNATEX. These nuts have a one-way drive style and are made of steel and zinc. They are grade 5 and have an open end type. The nylon insert is situated at the top of the nut and when tightened locks against the thread.