2” grommet in bottom shelf for easy wire management. Monitor shelf wire way in back of shelf for easy access of wiring between upper and lower portions of cabinet. 4 heavy-duty 5” casters, 2 locking. Cabinet supports 150 lbs. Keyboard shelf 20” x 15-1⁄2” x 2”. Upper locking compartment interior is 25-3/4” x 22-3/4” x 23-3/4”. Window with separate cam lock for security. Lower locking compartment with 1 adjustable shelf, adjusts on 1” centers is 21” x 23” x 24-1/2”. Flat panel kit included.