Description:Thewasher is a thin disk-shaped plate with a hole in the middle that is normally used to distribute the load of a threaded fastener, such as a screw or nut. Other uses are as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration. High-quality bolted joints require washers to prevent the loss of pre-load after the torque is applied. Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces.Features:This set of flat washers are made of high quality copper of goodelectrical conductivity and thermal conductivity.Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface.Can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration.Flatwasher is applied when the hole is a larger diameter than the fixing nut. There are many different sizes of washers in this set from which you can use for different purposes.Thisset includes many flat washers that can be used for a long time, so youdon't have to run to hardware store looking for washers for quite a while.Specifications:Material: CopperType: Flat washerIDxODxThickness(mm) andamp Quantity:M5x9x1 30pcsM6x10x1 30pcsM6x12x1 20pcsM8x12x1 20pcsM8x14x1 20pcsM10x14x1 20pcsM12x16x1 20pcsM12x18x1.5 20pcsM14x18x1 20pcsBox Size: 130 x 68 x 22mm or 5.12 x 2.67 x 0.86"Package Includes:200pcs x Washers