K148 Plaster-In LED Profile — Mud-In, Truly Trimless Gypsum Channel for 10.5mm Strip The K148 is a purpose-built plaster-in (mud-in) LED profile designed to disappear completely into the ceiling build. Unlike standard recessed channels that leave a visible trim edge, the K148 ships with perforated mounting flanges on both sides — simply screw or glue the flanges to the dryboard, skim plaster directly over them, and the finished result is a pure slot in the ceiling with no