Features: Made of high quality nylon material, these flat washers have long service. Flat washers can spread a load, and prevent damage to the surface being fixed, and prevent leakage. They can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. Flat washer is applied when the hole is a larger diameter than the fixing nut. There are many different sizes in this set. Each set contains many flat washers that can be used for a long time, so you don't have to run to hardware store looking for washers for quite a while. Specification: Material: Nylon Color: Black, White (Optional) Size & Quantity: M2 100PCS M2.5 100PCS M3 100PCS M4 100PCS M5 50PCS M6 50PCS Weight: 58g / 2oz(approx.) Package list: 1 box * Washers Package List 1Made of high quality nylon material, these flat washers have long service. 2Flat washers can spread a load, and prevent damage to the surface being fixed, and prevent leakage. 3They can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. 4Flat washer is applied when the hole is a larger diameter than the fixing nut. There are many different sizes in this set. 5Each set contains many flat washers that can be used for a long time, so you don't have to run to hardware store looking for washers for quite a while.