Shelf positions move in 1.2 in steps inside the cabinet, which is fine enough to set a shelf just above a tall bottle rather than wasting the space above it. The cabinet interior runs 23 x 8.5 x 39 in with an 8 in open compartment above the toilet, and the opening measures 23 x 32 in. Total capacity is 88 lbs on a 25 x 9.5 x 66 in frame in engineered wood and MDF weighing 37.5 lbs. White casework keeps a small bathroom bright. It fits over most standard toilets without wall fixing.