Mounting box for installation in concrete, suitable as a junction box with large terminal space, screw spacing 2 x 83.5 mm (3 9/32 inch) and 1 x 100 mm, complies with AFI standard, mounting box for installation in concrete, for installing "American Standard", equipment acc. to NEMA Publ. NO.OS 1, corresponds to the »"4" square box« for 2 units, screw spacing 2 x 83.5 mm (3 9/32 inch.), combinable
suitable for opposing formwork, for nail and magnet installation