This Axia Alloys 3/4" extended mount is for end mount style led light bars. The 6mm - 10mm ( pick your size ) slot on the L bracket can position your end mount light bar between 2.45" and 3.55" from the leading edge of the mounting bar to the center of the mounting screw.These pivoting clamps will allow you to mount Led light bars and traditional single post lights. A simple solution for mounting on bumpers, wakeboard towers as well.