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: - ColorGolden - Material: copper - Package size: approx. 178x100x23mm - Quantity: 200pcs - Size: (I/D / Depth) M5*9*1 30pcs M6*10*1 30pcs M6*12*1 20pcs M8*12*1 20pcs M8*14*1 20pcs M10*14*1 20pcs *16*1 20pcs *18*1.5 20pcs *18*1 20pcs Features: - copper material, melting to 1083 degree centigrade. - Good electrical conductivity and thermal conductivity. - 200Pcs 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: M5*9*1 30pcs M6*10*1 30pcs M6*12*1 20pcs M8*12*1 20pcs M8*14*1 20pcs M10*14*1 20pcs *16*1 20pcs *18*1.5 20pcs *18*1 20pcs Package list: 200pcs Washers 1pc