An adapter for mounting cable hangers to a mounting structure includes: a main panel having a hole therein; a pair of legs attached to and extending from the main panel, the legs having first and second ends; and a pair of fingers, each of the fingers having first and second sides, each leg being fixed at its first end to the first side of a respective leg. Each leg includes an engagement feature one its second side and each finger includes a mating engagement feature on its second end. In an unengaged condition, a gap is present between the second side of each leg and the second end of the corresponding finger, and in an engaged condition, the engagement feature of each leg is mated with the engagement feature of the corresponding finger, thereby forming a loop between the finger and the arm.