Cantilever brackets are commonly used in cable tray installations where the trays need to be mounted against walls. They provide strong support and are ideal for systems that require a high load capacity. Within the Unistrut catalog, brackets generally refer to load-bearing accessories used to mount or support. 75mm Premier Stand Off Brackets (HDG) The 75mm Premier stand off bracket is designed for securely spacing cable trays up to 75mm wide from wall or surface mounts. Ceiling-Mounted Supports: If you have the. Other add-ons include plastic nuts, bolts, swift clips, wire baskets, couplers, tees, crosses, and brackets.