Elongated toilet seat with lid – designed to complement a wide variety of elongated toilet designs. Made from heavy duty solid plastic, easy to clean and chemical resistant. Seat is ergonomically contoured to provide maximum comfort to the user. Secure mounting assembly while keeping installation fast and easy. Complete with integrally molded, permanent color-matched plastic hinges. Height: 3 (measured from rim of toilet fixture to the highest point on the seat). Overall Length: 18-1/2 (measured from the back of the hinges to the front most part of the seat). Overall Width: 14-1/4 (measured from left most point to the right most point on the seat). Inside Length: 12 (measured from the back to the front of the inner opening of the seat). Inside Width: 8 (measured from the left edge to the right edge of the inner opening of the seat). Distance Required Between Installation Holes: 5-1/2. Made from molded polypropylene.