The Mustang Professional MPHW-CEA516 Hardware -- Concrete Expansion Anchors, 5/16×1-1/4in -- 2-pack . Standard 1.5" threaded interface on all ceiling accessories, pipes and connectors. High grade steel tubing construction provides solid backbone for ceiling-mounted systems. Fabricated from high-grade steel /aluminum with durable epoxy powder coat finish. Threads are lubricated and protected in packaging. Security screws and tools are included.