Box Support, Mounting Accessories, Material Steel, Silver Color, For Use With Electrical Boxes and Mud Rings, Ideal For Supporting And Positioning 4 in Square And 4-11/16 in Electrical Boxes And Mud Rings Function, Open Design Allows Boxes To Be Positioned Anywhere Inside The Opening Of The TSRBS1625. Boxes Can Be Installed Off-Site And Then Are Fully Adjustable To Fit Varying Stud Spaces On-Site Without Needing To Modify The Box Location, Raised Height 4 in, Standards UL