All-welded construction with comfortable height as a standing desk/workstation. Riser shelf is 10 " deep and 10 " above desk surface. Locking storage drawer is 13 "W x 17 "D x 4-1/2 "H and comes with two keys. Lower shelves have 1-1/2 " retaining lips and 11-3/4 " shelf clearance. Durable powder coated finish. Stationary Models: Leg levelers allow height adjustment of desk surface from 39 "- 42 " high. Mobile Models: 3 " swivel brake casters with rubber wheels, 42 " high desk surface.