Angle 90° angled off: transmitter. Galvanised sheet steel (DX51D+Z275 MA-C) 3 mm – Dimensions 90 x 130 mm 3x perforated slotted hole size 15 x 30 mm length 300 in mm side dimensions 90 x 130 mm (external dimensions) visible side material type and thickness 3 mm galvanised sheet steel.