The universal design of this French Curve seat coordinates elegantly with most elongated toilets. This soft-close seat features innovative technology that prevents the lid from slamming and simplifies both cleaning and installation. Grip-Tight bumpers hold the seat firmly in place and prevent loosening and shifting. Kohler® Toilet Seat, French Curve® Q3™, Elongated Bowl, Quick Release Hinge, Closed Front, 5-1/2 in Mounting Hole, 14-3/16 in Width, 1-5/16 in Height, 18-1/16 in Length, 1-5/16 in Thickness, Plastic, Ice Gray™