Universal Fit for Elongated Toilets: Designed to fit most American standard elongated toilets, measuring 18.5"x14.5", mounting hole distance: 5.1"-5.9". Please measure your toilet bowl before purchase. Heavy-Duty Construction: Made from Premium PP material, R&T elongated toilet seat supports up to 400lbs. Rigorously tested through 50,000 cycles to ensure long-lasting performance and reliability. Easy Installation & Cleaning: Featuring top mount bolts for fast installation from above, eliminating the need to kneel down. Quick-detach design facilitates easy cleaning by quickly removing the lid. Soft Close: R&T heavy duty toilet seat features grip-tight bumpers for added stability and a slow-close design to prevent slamming and protect fingers, ensuring a quiet and secure bathroom experience. Serving US since 2002: R&T has served the U.S. with quality and reliability toilet repair kits for over 20 years. lf you ever have questions, our dedicated customer support team is always ready to help. R&T Elongated Toilet Seat B1130, Heavy-Duty up to 400 lbs, Slow Close, Non Slip and Easy to Keep Clean, Easy to Install, White Premium Premium PP Material