Features: Good electrical conductivity and thermal conductivity. 395pcs 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: 18 Quantity: 395PCs Box size: Approx. 28.5 x 13 x 3cm / 11.22 x 5.17 x 1.18inch Weight: 580g 395PCS Copper Washers Model: SizeQuality 5x8x1mm50Pcs 6x10x1mm30pcs 8x14x1mm30pcs 10x16x1mm20pcs 12x18x1mm20pcs 13x18x1mm20pcs 13x19x1.5mm20pcs 14x18x1mm20pcs 14x20x1mm20pcs 16x20x1mm20pcs 16x22x1mm20pcs 17x23x1.5mm15pcs 18x24x1mm15pcs 20x27x1mm15pcs 22x30x1.5mm10pcs 24x30x1.5mm10pcs 26x33x1.5mm10pcs Package Included: 1 x Box of 395pcs Copper Washers Package List 1Good electrical conductivity and thermal conductivity. 2395pcs solid copper sump plug washer set for multiple choices. 3All contained in a compact and see through compartmented plastic case. 4Great for sump plugs, water, fuel and hydraulic fittings. 5A sump plug washer set to suit all types of engines be it Car, Marine, Generators, Machinery and Plant.