All-welded 12 gauge construction. Top surface measuring 24" deep x 36" wide, is enclosed on three sides with flush front edge to provide an open writing surface. The height can be set from 39-1/2" - 42-1/2" above the floor. The 3 shelf version has 13" of clearance between the three shelves and the 2 shelf station has 27 " of clearance. Riser measures 10" deep and is 12" above the writing surface allowing storage of most 3 ring binders. Floor glides adjust to almost any uneven floor surface.