Premium Material: These washers are made of high quality 304 stainless steel material, are sturdy and durable. Multifunctional: These spring washers can be used as a spacer, wear pad, preload indicator, locking device and reduce vibration. Optional Size: This set contains many different sizes from M3 to M10. Easy to store. All washers are well packed in a plastic box for convenient storage. Convenience: Each set contains many washers that can be used for a long time, so you don't have to search for washers in the hardware store. Product Name: Stainless Steel Washer Gasket Spring Washer Elastic Gasket Set Product Material: 304 Stainless Steel Product Quantity: 300pcs Product Use: Flexible washer that can prevent bolts or nuts from loosening. box size: 125*65*22mm Product weight: about 0.139kg/box Package includes: 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 the other pictures only show the effect. Due to the differences between different monitors, the picture may not reflect the actual color of the item. . due to manual measurement. Please allow the deviation. Thank you!