This self-centering jig is easy to adjust, with a capacity of 3/8'' to 1''. It is constructed from durable steel and plastic for long service life. The jig set includes 1/4-Inch, 5/16-Inch, 3/8-Inch, 7/16-Inch and 1/2-Inch drill guides to accommodate different dowel sizes. This doweling jig is perfect for creating clean and accurate dowel holes in the workpieces, with the clamping wide capacity of 3/8" to 6" - no need to adjust the jig for different stock thicknesses. PROS🟢 Efficient at drilling holes Can make round wood sticks joints CONS🔴 Only 2 of the holes accept threaded bushings