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:18x24.5x1mm/0.71''x0.96''x0.04''(Inner Dia*Outer Dia*Thickness) Package Content:20 x Copper Washer