The Mustang Professional MPHW-CEA38 Hardware – Concrete Expansion Anchors, 3/8×1-1/2in – 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 nish. Threads are lubricated and protected in packaging. Security screws and tools are included.