This kit consists of two, compact, rigid and strong mounting brackets that are used to secure either: 100mm, 220mm or 300mm (straight) duct systems to overhead, superstructure, e.g. Unistrut style ironwork, in Exchanges or CO’s. The bracket features: a 12.5mm wide x 18.5mm long central slot; an M8 bolt/screw mounting hole; and an 8mm deep, 90 o side edge return, that prevents the bracket twisting when installed on Unistrut or brackets. The brackets typically bolt to a Unistrut, horizontal, cantilever, bracket, 400mm long; which is available separately. Standard Unistrut mounting fasteners are used. This Mounting Kit can also be used with Mounting Bracket, Heavy Duty, Cantilever Type (Part No: TC1279324) for 220mm and 300mm duct; available separately. They can also be used for 100mm duct with Mounting Bracket, Heavy Duty, Cantilever Type (Part No: TC1279-318); available separately. This fastening system is useful where overhead space is limited or restricted, and eliminates rework to install additional supports for optic fibre ducting after the superstructure has been installed.