【ROUND SIZE】Please measure your toilet bowl to confirm you need ROUND size. Our toilet seats FIT ALL AMERICAN TOILET BRANDS including Crane, Universal Rundle, Eljer, Delta, Bemis, Caroma and Gerber ETC… 【QUICK RELEASE HINGES】Quickly and easily removed for cleaning or replacement. 【NO SLAMMING】Toilet seat close slowly and quietly,without slamming or pinching fingers. 【QUICK INSTALLATION】To prevent the seat from moving, we have upgraded the new version of the mounting accessories, No professional skills and extra tools are required, and the installation can be completed within 3 minutes using the included installation accessories. 【INSTALLATION TIPS】 Make sure the discs have been rotated to 180°before installation.(Check detail picture in your instraction or our product web page.) Also you can use spare holes if you need longer size.Note:If you have any further questions in installation or missing hardware in the package, please feel free to contact us by email. We will solve any problems for you in 24H.