uxcell a15072100ux0300 M3x0.5mm Zinc Plated Self-Locking Nylon Insert Hex Lock Nuts 50pcs (Pack of 50)
1.Hex head, female threaded inside, metal material, anti-loose hex nut.2.Used with a machine or cap screw for mechanically joining materials together.3.Used widely for matching screws or bolts.