Description:The_x005F_x000D_washer is a thin disk-shaped plate with a hole in the middle that is _x005F_x000D_normally used to distribute the load of a threaded fastener, such as a _x005F_x000D_screw or nut. Other uses are as a spacer, wear pad, pre-load indicating _x005F_x000D_device, locking device, and to reduce vibration. High-quality bolted _x005F_x000D_joints require washers to prevent the loss of pre-load _x005F_x000D_after the torque is applied. Washers are also important for preventing _x005F_x000D_galvanic corrosion, particularly by insulating steel screws from _x005F_x000D_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.Flat_x005F_x000D_washer is applied when the hole is a larger diameter than the fixing _x005F_x000D_nut. There are many different sizes of washers in this set from which _x005F_x000D_you can use for different purposes.This_x005F_x000D_set includes many flat washers that can be used for a long time, so you_x005F_x000D_don't have to run to hardware store looking for washers for quite a _x005F_x000D_while.Specifications:Material: CopperType: Flat washerID*OD*Thickness(mm) & Quantity:M5*9*1 30pcs_x005F_x000D_M6*10*1 30pcs_x005F_x000D_M6*12*1 20pcs_x005F_x000D_M8*12*1 20pcs_x005F_x000D_M8*14*1 20pcs_x005F_x000D_M10*14*1 20pcs_x005F_x000D_M12*16*1 20pcs_x005F_x000D_M12*18*1.5 20pcs_x005F_x000D_M14*18*1 20pcsBox Size: 130 x 68 x 22mm / 5.12 x 2.67 x 0.86"_x005F_x000D_Package Includes:200pcs x Washers