Features A washer is used when the hole is larger in diameter than the mounting nut. There are many different sizes of washers in this set, which you can use for different purposes Washers can distribute a load and prevent damage to the surface to be attached and isolate steel screws from the surface Can be used as a spacer, wear pad, bias indicator, locking device and to reduce vibration This set of washers is made of high-quality copper with good electrical conductivity and thermal conductivity This set contains many washers that can be used for a long time, so you don't have to run to the hardware store for a long time to search for washers Description: The washer is a thin disc-shaped plate with a hole in the middle, which means is usually used to distribute the load of a threaded fastener, such as screw or nut. Other uses include spacers, wear pads, bias indicator device, locking device and to reduce vibration. High quality bolted joints require washers to prevent loss of preload after applying torque. Also for prevention, washers are important galvanic corrosion, especially by insulating steel screws made of aluminium surfaces. Specifications: Material: copper. Type: Washer ID*OD*Thickness (mm) Quantity: M5*9*1 30pcs M6*10*1 30pcs M6*12*1 20pcs M8*12*1 20pcs M8*14*1 20pcs M10*14*1 20pcs M12*16*1 20pcs M12*18*1.5 20pcs M-14*18*1 20pcs Box size: 130 x 68 x 22 mm/5.12 x 2.67 x 0.86 inches. Package includes: 200 x washers. Package List