Qualfast: M12 Hex Thin Nut Z&Y (4) Hexagon Thin Nut Metric Steel - ZY (Zinc Yellow Passivated) Grade 4 DIN 439 2 MPN: M12 Hex Thin Nut Z&Y (4) Attributes: Box Quantity: 100 Driving Features: Hexagon Grade: 4 Material: Steel Surface Treatment: Zinc Plated Yellow Passivated Thread: Metric Thread Direction: Right Thread Size: M12