50pcs/lot M2 M2.5 M3 M4 M5 M6 M8 Nickel Plated Steel Hex Nylon Insert Lock Nut Self-locking Locknut DIN985
https://www.vogueparade.com/shopping/EN/42/1/1005003457777793/50pcslot-m2-m25-m3-m4-m5-m6-m8-nickel-plated-steel-hex-nylon-insert-lock-nut-self-locking-locknut-din985//