Invacare ProBasics - Clamp-On Raised Toilet Seat with Arms attaches easily to most round toilet bowls with the clamp-on locking mechanism that tightens with just one hand. The ergonomic handles are attached directly to the toilet seat and the contoured seat is made of a molded composite that is extremely durable. Easy-to-clean. Ideal for those with limited dexterity. Replaces previous model INV1302RTS. Seat Dimensions (including the arms): 17" x 17". Seat Elevation: 5 1/2" Weight Capacity: 300 lbs. Sold by the each.