1、Good electrical conductivity and thermal conductivity. 2、568pcs solid copper sump plug washer set for multiple choices. 3、All contained in a compact and see through compartmented plastic case. 4、Great for sump plugs, water, fuel and hydraulic fittings. 5、A sump plug washer set to suit all types of engines be it Car, Marine, Generators, Machinery and Plant. Features: Good electrical conductivity and thermal conductivity. 568pcs solid copper sump plug washer set for multiple choices. All contained in a compact and see through compartmented plastic case. Great for sump plugs, water, fuel and hydraulic fittings. A sump plug washer set to suit all types of engines be it Car, Marine, Generators, Machinery and Plant. Specifications: Material: Copper Size types: 30 Quantity: 568PCS Box size: Approx. 18 x 27 x 4.5cm / 7.08 x 10.62 x 1.77inch Weight: 744g Washer Size: 40pcs x Copper Washers4*8*1    40pcs x Copper Washers5*9*1    40pcs x Copper Washers6*10*1   40pcs x Copper Washers6*12*1   40pcs x Copper Washers8*12*1   40pcs x Copper Washers8*14*1   40pcs x Copper Washers10*14*1 40pcs x Copper Washers10*16*1 40pcs x Copper Washers12*16* 1.5   40pcs x Copper Washers12*18* 1.5   40pcs x Copper Washers13*18* 1.5   40pcs x Copper Washers14*18* 1.5 5pcs x Copper Washers14*20* 1.5   5pcs x Copper Washers16*20* 1.5   5pcs x Copper Washers17*21* 1.5   5pcs x Copper Washers17*23* 1.5   5pcs x Copper Washers18*22* 1.5   5pcs x Copper Washers18*24* 1.5   5pcs x Copper Washers20*24* 1.5   5pcs x Copper Washers20*26* 1.5   5pcs x Copper Washers21*26* 1.5   5pcs x Copper Washers21*28* 1.5  5pcs x Copper Washers22*27* 1.5   5pcs x Copper Washers22*29* 1.5   5pcs x Copper Washers24*30*2     5pcs x Copper Washers26*32*2     5pcs x Copper Washers27*32*2     5pcs x Copper Washers28*34*2     5pcs x Copper Washers30*36*2     3pcs x Copper Washers33*39*2     Package Included: 1 x Case of 568pcs Copper Washers