_x000D_ The washer 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. _x000D_ _x000D_ _x000D_ Features: _x000D_ This set of flat washers are made of high quality copper of good electrical conductivity and thermal conductivity._x000D_ _x000D_ Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface. _x000D_ Can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration._x000D_ _x000D_ Flat washer 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. _x000D_ This 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. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: Copper _x000D_ Type: Flat washer _x000D_ ID*OD*Thickness & Quantity: _x000D_ M5*9*1 10pcs _x000D_ M6*10*1 10pcs _x000D_ M6*12*1 10pcs _x000D_ M8*12*1 10pcs _x000D_ M10*14*1 10pcs _x000D_ M10*16*1 10pcs _x000D_ M10x18x1 10pcs _x000D_ M12*16*1 10pcs _x000D_ M12*18*1.5 10pcs _x000D_ M14*18*1 10pcs _x000D_ M14*20*1.5 10pcs _x000D_ M16*22*1.5 10pcs _x000D_ M18*24*1.5 10pcs _x000D_ M20*26*1.5 10pcs _x000D_ M22*28*1.5 10pcs _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 150pcs x Washers