110pcs Imperial Standard Stainless Steel Flat Washer Plain Washers Assortment Kit with Box Features: Made of steel material, these flat washers are sturdy and has long service. Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface. 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 includes 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. Specifications: Material: Stainless steel Type: Flat washer Standard: Imperial standard Size & Quantity: 1/4,  10pcs 3/8,  10pcs 5/16, 10pcs 4-40, 20pcs 6-32, 20pcs 8-32, 20pcs 10-32, 20pcs Weight: 127g / 4.5oz(approx.) Package list: 1 box * Washers