Product Name : Copper Washer Inner Diameter : 6mm/0.24" Outer Diameter : 10mm/0.4" Thickness : 1mm/0.04" Material : Copper Package Content : 50(+/-2%) x Copper Washer Color : Weight : 19g Max. Operation temperature: 35 Celsius Max. Operation pressure: 16MPa Melting point: 1083 Celsius Copper Provides a Tighter Seal and Greater Heat Endurance than Steel and Rubber Washers. Widely applied in the flange and the connection of the chemical plant, electricity generating station, nuclear power station, and electronic, digital consumer products, hardware, precision instruments, electrical appliances, bearings, air pumps, water pumps, water valves, air cylinder, sealing the high pressure systems . Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.