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These 5/16 in. Tank Bolt Washers from Danco install between the china of the toilet tank and the bolts that connect the tank to the bowl. The washers are made of flexible rubber that will endure the rigors of everyday use. They allow for quick and easy installation.Durable rubber construction,Round shape and flexible design for 5/16 inch bolts,Replaces a worn toilet tank washer,Installs between the china of the toilet tank and the bolts that connect the tank to the bowl,Easy to use