Description:Copper used washers feature abrasion,temperaure and pressure resistancy.Function:Seal the sump plug nut to the sump tightly.Great for sump plugs, water, fuel and hydraulic fittings.Application: Automobile, Pump, Electrical Appliances, Doors and Windows, Bearings,etc.Size:16x21.5x1mm/0.63''x0.85''x0.04''(ID*OD*T) Package Content:50(+/-2%) x Copper Washer .