Specification: Material: 65 Manganese Steel Quantity: 280 PCS Size: Lock Washer: M3*9mm, M4*12mm, M5*12mm, M6*14mm, M8*18mm, M10*20mm, M12*25mm Plastic Box: 9.5*17*2.2cm Color: Black Package Includes: 40 x M3 Starlock Washers 40 x M4 Starlock Washers 40 x M5 Starlock Washers 60 x M6 Starlock Washers 40 X M8 Starlock Washers 40 X M10 Starlock Washers 20 X M12 Starlock Washers Satisfaction Guarantee: If you have any problems with our product