uxcell 20Pcs 30mmx38mmx1.5mm Flat Copper Crush Washer Sealing Ring Gasket Product Name : CopperWasher;Inner Diameter : 30mm/1.2" Outer Diameter : 38mm/1.5";Thickness : 1.5mm/0.06" Material : Copper;Color : Copper Tone Weight : 91g Package Content : 20 Pcs x Copper Washer