XMark Commercial Powerbase Ab Attachment XM-7635 11-gauge 2" x 3" steel construction Four adjustable angles and a centrally located support handle for assistance during mount and dismount Ideal for in-home, light institutional, and commercial use Extra-large 4.33" vinyl wrapped roller pads, ergonomically spaced for comfort and ease of use Ultra-thick 3" Duracraft cushions with tear-resistant, double stitched Duraguard vinyl