For Devices With Mounting Screw Centers Of 1 15/32", 1 5/8", 1 11/16", or 1 27/32" (37MM, 41MM, 44MM, or 46MM). Will Accept Any Device That Mounts On "G" or "H" Type Conduit Fittings. Note: Certified to Canadian Safety Standards For Sale In Canada. When Ordering These Products, Change The "V" Color Prefix to "VC" to Denote The Canadian Versions.