Forgefix 100NYLOC4 M4 Nylon Insert NutThis is a Forgefix M4 Nylon Insert Nut, also known as a Nyloc nut. It is designed to prevent loosening under vibration, making it suitable for a wide range of mechanical applications where a secure fastening is required. Supplied in a convenient bag of 100.Features Nylon insert provides locking action Hexagon shape for standard wrench use Zinc plated finish for corrosion resistanceSpecifications Brand: Forgefix MPN: 100NYLOC4 EAN: 5028485063346 Size: M4 Pack Quantity: 100