ALL-WELDED 12 GAUGE CONSTRUCTION. TOP SURFACE MEASURING 24"" DEEP X 36"" WIDE IS ENCLOSED ON THREE SIDES WITH A 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 3 SHELVES AND THE 2 SHELF VERSION 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