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 plate, preload indicator, locking device, and to 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 includes many washers, which can be used for a long time. So you don't have to look for washers in the hardware store. Product Name: Stainless steel flat washer gasket spring washer spring gasket 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. 0.139 kg/box Package Included: m3 75 pcs m4 75 pcs m5 50 pcs m6 50 pcs m8 30 pcs m10 20 pcs Note: It does not include other items, 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. Thank you!