This set of copper washers are made of quality copper material with melting to 1083 degree centigrade. They have good electrical conductivity and thermal conductivity. Comes in a nice case and are in individual comparments by size. Insert paper has actual sizes so it is visible when case is open corresponding to each compartment making it easy to identify the washer size you need. Specification: - ColorAssorted Color - Material: copper - Package size: approx. 178x100x23mm - Quantity: 120pcs - Size: (I/D / Depth) 6x12x1mm, 20pcs 8x14x1mm, 20pcs 10x14x1mm, 15pcs 12x18x1.5mm, 15pcs 14x18x1mm, 15pcs 16x22x1.5mm, 15pcs 18x24x1.5mm, 10pcs 20x26x1.5mm, 10pcs Features: material, melting to 1083 degree centigrade. - Good electrical conductivity and thermal conductivity. - 120Pcs solid copper sump plug washer set. 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 , Marine, Generators, Machinery and Plant. - Note: Please allow 1-5mm errors due to manual measurement,Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Items Included: 6x12x1mm 20pcs 8x14x1mm 20pcs 10x14x1mm 15pcs 12x18x1.5mm 15pcs 14x18x1mm 15pcs 16x22x1.5mm 15pcs 18x24x1.5mm 10pcs 20x26x1.5mm 10pcs Package list: 120pcs Washers 1pc