Zinc Plated Hex Nuts - TOOGOO(R) M2 Zinc Plated Nylock Nylon Insert Hex Lock Nuts Black 50pcs 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"