PADDED HALF LAP TRAYThe tray is padded with in (12 mm) poly foam covered with black vinyl and measures 10 in wide x 20 in long (25 x 51 cm). This half lap tray has an epoxy coated steel slide on mounting bracket. Our hinge system allows the tray to fold completely over and ride flush with the side of the wheelchair when not in use. This is a very handy feature. The slide on bracket is easy to mount just slide over the arm rest. No tools required. Fits most arm rests.