SLB interface brackets are required for installations using our RPA™, RPM™ and Smart-Lift™ Series Mounts (exception: RPM models with the optional Q-Lock™ Integrated Security feature use SLM brackets instead). Chief offers both custom and universal versions of SLB projector interface brackets. - For Smart-Lift installations, SLB brackets must be ordered separately. IMPORTANT: This model (SLB-305) does not work with Chief's SL-150 or SL-236 Mounts.