The Extron MAAP 304 IS is a mounting frame with room for up to four single-space MAAP - Mini Architectural Mounting Plates. The MAAP 304 IS is compatible with BTicino 503E, Gewiss GW 24 203, and Vimar V71613 or V71303 three module electrical mounting boxes with 83.5 mm center screw distance. Available in a black finish. Dimensions: 2.75" x 4.5" x 0.1" (7 x 11.4 x 0.25 cm).