CA21 - 520PC MACHINE SCREWS AND NUTS ASSORTMENT• Metric, Pan Head Phillips, Zinc Plated.• 12 Sizes: 3mm to 6mm x 10mm to 25mm Long• 520 PiecesReplacement Packs AvailablePart # Size Pack QtyC21-1 M3 x 10mm 20C21-2 M3 x 16mm 20C21-3 M3 x 23mm 20C21-4 M4 x 10mm 20C21-5 M4 x 16mm 20C21-6 M4 x 20mm 20C21-7 M5 x 10mm 20C21-8 M5 x 16mm 20C21-9 M5 x 20mm 20C21-10 M5 x 25mm 20C21-11 M6 x 16mm 30C21-12 M6 x 20mm 30C21-13 M3 x 0.5 Nuts 60C21-14 M4 x 0.7 Nuts 60C21-15 M5 x 0.8 Nuts 80C21-16 M6 x 1.00 Nuts 60