Description: _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 hardened steel 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*1mm 30pcs_x000D_ M6*10*1mm 30pcs_x000D_ M6*12*1mm 20pcs_x000D_ M8*12*1mm 30pcs_x000D_ M10*14*1mm 30pcs_x000D_ M8*14*1mm 20pcs_x000D_ M12*16*1mm 25pcs_x000D_ M14*18*1mm 25pcs_x000D_ M12*18*1.5mm 20pcs_x000D_ M16*20*1.5mm 20pcs_x000D_ M16*22*1.5mm 15pcs_x000D_ M20*26*1.5mm 15pcs _x000D_ Box Size: 17.5 x 10 x 2.3cm / 6.89 x 3.93 x 0.9"_x000D_ _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 set x Washers 1This set of flat washers are made of high quality copper of good electrical conductivity and thermal conductivity 2Flat washers can spread a load, and prevent damage to the surface being fixed, and insulate steel screws from surface 3Can be used as a spacer, wear pad, pre-load indicating device, locking device, and to reduce vibration 4Flat 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 5This 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