Qualfast: M12 Dome Lock Nut N/M Insert BZP (6) Domed Cap Nut with Non-Metallic insert. MPN: M12 Dome Lock Nut N/M Insert BZP (6) Attributes: Box Quantity: 100 Driving Features: Hexagon Grade: 6 Leading Standard: DIN 986 Material: Steel Nut Type: Dome Surface Treatment: Zinc Plated Thread: Metric Thread Direction: Right Thread Size: M12