Therafin’s versatile Adjustable Height Channel Bracket is attached to a Therafin half tray that is made out of 3/8" Birch plywood with a clear melamine laminated finish. The bracket slides the tray on from the front, and flips the tray up and out to the side for easy transfer. Bracket fits many standard armpads with maximum dimensions of up to 2-1/2″ wide by up to 1-1/2″ tall. The wraparound shape half trays have a larger work surface yet accommodates a larger belly.