This suspension mounting bracket kit is used to attach 220mm x 100mm plastic duct to existing duct mounting ironwork, from above. i.e. it allows additional ducting to be fitted to existing mounting brackets or suspension rods. This kit is used with either: M12 (1/2") dia and M16 (5/8") dia rods, nuts and washers. The kit (Part No: TC1279-106PK10) comprises 10 suspension brackets.