TQVAI Over The Tank 2 Roll Toilet Bath Tissue Holder,Chrome Finish Toilet paper holder fits over the tank (1 side only) for compact storage Fit for tank with a at least 7 inch width, the dept of hanging over toliet tank is 1-1.24 inch(inner depth is 1.24 inch),the distance between 2 layer is 4 inch, please check it before purchase Easy installation requires no tools - simply lift the tank lid and slide on bracket Made of steel with chrome finish, waterproof and rustproof anti-corrosion Size: 7 x 7-9/10 x 3 inch; Inner depth: 2-1/4 inch