Features: Made of high quality 304 stainless steel material, these washers are sturdy and has long service. They can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. There are many different sizes in this set, ranging from M2 to M10. All washers are well packed in a plastic box for convenient storage. Each set includes many 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. Specifications: Material: Stainless steel 304 Type: Spring washer Quantity & Size: 30pcs x M2 30pcs x M2.5 30pcs x M3 30pcs x M4 20pcs x M5 20pcs x M6 10pcs x M8 10pcs x M10 Weight: Approx.76g/2.7oz Package list: 180 x Washers Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.