Self locking Nuts DIN 1663 Steel M4 100 Pcs. M6 100 Pcs. M8 100 Pcs. M10 100 Pcs. M12 100 Pcs. Washers UNI 6592 HV 100 M2 100 Pcs. Self locking Nuts UNI 7473 Steel M2 100 Pcs.