This is a mounting bracket for the Dewalt 660 router used in many Shapeoko CNC mills. I cant take credit for the original desIgn, that goes to Improbable Construct. I just modified it a bit since the orginal was meant to be milled from HDPE. I've been using it with good sucess for a few months. as always the sketchup file is included for any changes you may want to make for the original in DXF format seehttp://www.shapeoko.com/wiki/index.php/DW660