uxcell M2.5x0.45mm Zinc Plated Nylock Nylon Insert Hex Lock Nuts 50pcs Thread Size: (Female)M2.5; Product Name: Nylon Lock Nuts Material: Zinc Plated; Weight: 37g Package Content: 50(+/-2%)Pcs x Nylon Lock Nuts; Main Color: Silver Tone Height: 3.5mm/0.14"; Pitch: 0.45mm Width Across Flats: 5mm/0.2"; Width Across Corners: 5.4mm/0.21"