All tub transfer benches are designed to fit standard bathtubs. Vinyl grips on tubing prevent marring tub.  Short back discourages reclining and is also removable.  "Tube in a Tube" construction for added strength.  Tub must be 22" wide at center of tub.  Take this measurement halfway down the wall and measure inside wall to inside wall dimension.  Perineal openings are 8"W x 10"L or 9"W x 11"L, depending on deep depth. Outside legs adjust from 18.5" to 20.5".  Although this item is universal, order R or L for bathroom configuration when possible.