The mounting bracket kit is used to attach 50mm plastic duct to existing duct mounting ironwork. It allows 50mm ducting to be fitted to existing ½" (12mm) dia suspension rods. The kit consists of: a 50mm duct mounting bracket with 6mm attaching stud, a straight bracket, nut & washer. The mounting bracket grips the 50mm ducting and bolts to the straight bracket using the attaching stud. The straight bracket bolts to a standard 1/2" (12mm) diameter (Part No: 93x12 x1000) threaded steel rod; which is available separately. Nut kit ½" UNC (Part No: TC1279-19KIT) is available separately.