Slow close hinge top mount with adjustable release 'n' clean. Patented slow close damper system. Strong & durable - injection molded of high-impact, chemically resistant polypropylene. Comfortable, ergonomically designed ring. Thick, contoured ring provides greater support. Adjustable hinge for a perfect fit on any standard ansi toilet bowl. Closed front with cover. Durable, rust-free installation hardware. Molded-in bumpers for added safety and comfort. Easy, self-aligning, top mount installation with just a screwdriver. Uv ingredient added to maintain color. Contractor quality hinge.