Therafin’s Permobil Corpus HD 3G Bayonet Style Bracket is attached to a Therafin half tray that is upholstered with black satin vinyl over 1″ thick foam, on a 1/2″ thick wood base. It’s easy to wipe clean, and all materials are latex free.The bracket slides the tray on from the front, and flips the tray up and out to the side for easy transfer. Bracket fits the Permobil Corpus HD 3G armpads and mounts under the armpad and provides a bayonet style flip mechanism that allows the tray to by loosening a knob. The HD version of the bracket accomodates pad thicknesses up to 1-3/4". Standard shape half trays have an angled outer edge, with a larger work surface.