The 2800 Series Adjustable Lift Lid Student Desk represents the most well constructed, heavy-duty lift lid desk on the market. The bookbox is made of heavy-duty 20-gauge steel with rolled edges for added strength and safety. The 5/8" thick plastic writing surface is 18" x 24". Attachment to the box is made by a high quality, full-width piano hinge. Two adjustable spring hinges and rubber bumper cushions assure safe, secure and quiet operation even by young students. The desk frame is constructed of 16-gauge tubular steel and the desk is adjustable from 22"-29" in 1" increments utilizing a dual bolt attachment for unparallelled strength and stability. Nylon base, self leveling glides reduce unwanted noise in the classroom.