The Multifix Prefal 1 gang junction box is designed for single board. Its matching mounting box can be recessed into the surface of the wall with flush type. It has 7 flexible stubs. The junction box is made of PEHD (polyethylene high density), making it durable and resistant. The dimensions are (W) 57 mm x (D) 145 mm. This junction box is designed for single board. This device is sold in set of 25. It features protective untreated surface treatment.