Description. 10" x 10" TM - Multi-Purpose Access Panel with 1" Trim for Walls & Ceilings - JL Industries. The TM is a paintable all purpose panel for installation in an opening in wallboard, plaster, masonry, brick or panelling. The 1" flange vers the cut opening. Provide access to a wide variety of wall or ceiling installations including plumbing, HVAC and mmuncations.