ITEM NAME:280PCS M5-M20 Copper Crush Washer Gasket Set Flat Ring Seal Assortment Kit Set Description: 280Pcs Flat ring copper seal washer gasket assortment,contains 12 sizes:M5*9*1mm, M6*10*1mm, M6*12*1mm, M8*12*1mm, M10*14*1mm, M8*14*1mm,M12*16*1mm, M14*18*1mm, M12*18*1.5mm, M16*20*1.5mm, M16*22*1.5mm, M20*26*1.5mm. These flat washers made of copper, which provides more tighter seal and higher heat resistance. Flat washers are mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure. All of these items are packed in a sturdy case, easy for your storage and use! Widely meet your various home DIY demands and suitable all types of engines be it car, marine, generators, machinery and plant use. Specification: Material: Copper Size Chart: Storage Case Size: approx. 175x40x20mm/6.9x1.6x0.8inch. Package Includes: 30 Pieces M5*9*1mm 30 Pieces M6*10*1mm 20 Pieces M6*12*1mm 30 Pieces M8*12*1mm 30 Pieces M10*14*1mm 20 Pieces M8*14*1mm 25 Pieces M12*16*1mm 25 Pieces M14*18*1mm 20 Pieces M12*18*1.5mm 20 Pieces M16*20*1.5mm 20 Pieces M16*22*1.5mm 15 Pieces M20*26*1.5mm Note: Please allow slight dimension difference due to different manual measurement. SKU: DMO0010322279018622.15 Pieces M20 26 1.5mm. 30 Pieces M5 9 1mm. These flat washers made of copper, which provides more tighter seal and higher heat resistance. Material: Copper. Flat washers are mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure.