50Pcs 17mmx21mmx1.5mm Flat Copper Crush Washer Sealing Ring Gasket Product Name : CopperWasher;Inner Diameter : 17mm/0.67" Outer Diameter : 21mm/0.83";Thickness : 1.5mm/0.06" Material : Copper;Color : Copper Tone Weight : 58g Package Content : 50 Pcs(+/-2%) x Copper Washer