500PCS Internal Tooth Star Lock Washers, M2.5 M3 M4 M5 M6 M8 M10 M12 Push Nuts A
Fastener Size m2.5 m3 m4 m5 m6 m8 m10 m12. It uses spring pressure to regulate reinforced shaped objects and is used to tighten and loosen threaded fittings. Size Internal Tooth Star Lock Washer;500 PCS.