170Pcs Nylon Lock Nut M3 M4 M5 M6 M8 M10 M12 Assortment Set A2 Stainless Steel

Thread Size: M3 M4 M5 M6 M8 M10 M12. 【Hex Lock Nuts】: Hex lock nuts are used to firmly fasten screws or bolts, and to hold fasteners in place when used with unthreaded holes. The six sided design makes them easy to tighten with a wrench or socket.