Rockfon® Infinity™ D Perimeter Trim is the factory-engineered alternative to in-field drywall framing and is available in a variety of perimeter depths. This drywall ceiling trim accepts standard 5/8" gypsum panels and includes grooved and primed taping flanges for drywall compound and paint. Made from sturdy extruded aluminum, the trim is created in one-piece for fewer visible lines.