uxcell M4 x 0.7mm 304 Stainless Steel Nylock Nylon Insert Hex Lock Nuts 50pcs Product Name: Nylon Lock Nut; Material: 304 Stainless Steel Weight: 44g; Package Content: 50(+/-2%) x Nylon Lock Nuts Thread Dia: M4; Main Color: Silver Tone Height: 4mm/0.16"; Pitch: 0.7mm Width Across Flats: 7mm/0.28"