Premium Material: These washers are made of high quality 304 stainless steel, strong and durable. Multifunctional: These spring washers can be used as a spacer, wear pad, preload indicator, locking device and reduce vibrations. Optional Size: This set includes many different sizes from M3 to M10. easy to save. All washers are well packed in a plastic box for convenient storage. Convenience: Each set contains many washers, which can be used for a long time. So you don't have to look for washing machines in the hardware store. Product Name: Stainless Steel Flat Washer Packing Spring Washer Spring Seal Kit Product Material: 304 Stainless Steel Product Quantity: 300 pcs Product Use: Flexible flat washer that can prevent bolts or nuts from loosening. Panel size: 125*65*22mm Product weight: approx. 0.139kg/box Package included: m3 75pcs m4 75pcs m5 50pcs m6 50pcs m8 30pcs m10 20pcs Note: It does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the difference between different monitors, the picture may not reflect the actual color of the item. . due to manual measurement. Please allow the deviation. Thanks!