12 DIFFERENT SIZES: 12 different sizes of flat copper gaskets in this set which you can use for different purposes WIDE APPLICATION: These copper gaskets used primarily to distribute the load on threaded fasteners, also used as gaskets, spacers, wear pads, preload indicating devices, locking devices and reducing vibration. MATERIAL HIGH QUALITY: These flat washers are made of high quality copper with good electrical and thermal conductivity. USED FOR A LONG TIME: This set includes many copper drain seals which can be used for a long time. So you don't have to go to a hardware store looking for washers for quite a while. TIDY: Yeuri 280pcs copper washers are packed in a divided plastic square box ID*OD*Thickness and quantity: M5*9*1mm 30pcs M6*10*1mm 30 pieces M6*12*1mm 20 pieces M8*12*1mm 30 pieces M10*14*1mm 30 pieces M8*14*1mm 20pcs M12*16*1mm 25pcs M14*18*1mm 25pcs M12 *18*1.5mm 20pcs M16*20*1.5mm 20pcs M16*22*1.5mm 15pcs M20*26*1.5mm 15 pieces Features: Material:Copper Type:Flat washer Package includes:280pcs copper flat washers</