Blue Banger Hanger internally threaded inserts are cast into the underside of the concrete deck after being fastened to the top of wood forms or metal deck. Once the concrete has cured, the anchor provides an attachment point for threaded rod used to hang electrical, mechanical and plumbing utilites. The Blue Banger Hanger insert is the only pre-pour insert to offer the patented multi-thread design that enables one size to insert to handle multiple diameters of threaded rod.