Constructed of a durable plastic, meaning it was built for longevity, durability and reliability. includes: (2) tank bolts (3/8-inch x 3-1/4-inch), washers, nuts and (1) sponge rubber spud gasket. Designed for use with Gerber toilets. Easy-to-install selection for user simplicity. Will keep the toilet tank solidly attached while preventing leaks between the tank and the bowl.