Big John Standard Toilet Seat - 800-Pound Weight CapacityADA Compliant. With a larger seat size, this Big John toilet seat provides a more comfortable sitting area. The solid plastic seat includes stain and chemical resistant nylon hinges and non slip bumpers. Overall Dimensions with Lid: 19" L x 19" W (Front to Back) x 2 1 8" H ( 1 2") 1 1 2" Rise for Seat Portion Hole Opening for Seat: 8 1 2" L x 11 1 2" W (Front to Back) ( 1 2") White Finish Fits Standard Round and Elongated Toilets 800 Pound Capacity