Dado Nyloc 20MM 20 filettatura metrica zincata per set viti e bulloni esagonali 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.