ITEM NAME:M2 Zinc Plated Nylock Nylon Insert Hex Lock Nuts Black 50pcs E8W8 M2 Zinc Plated Nylock Nylon Insert Hex Lock Nuts Black 50pcs E8W8 Thread Size: (Female)M2; Product Name: Nylon Lock Nuts Material: Zinc Plated Main Color: Black; Height: 3mm/0.12" Width Across Flats: 4mm/0.16"; Width Across Corners: 4.3mm/0.17" 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. Package Content: 50(+/-2%)Pcs x Nylon Lock Nuts Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.