ITEM NAME:165pcs Boxed 304 Stainless Steel Nylon Lock Nut Locknut Self-Locking Nut NRJ.165pcs M3 M4 M5 M6 M8 M10 M12 stainless steel 304 nylon self-locking nut combination set. Product list :165pcs lock nut, lock-up nut, lock-up nut, self-locking nut. Material: 304 stainless steel + nylon.