Self Centering Dowel Wood Jointing Drilling Doweling Drill Hole Dowling Jig Tool Automatically Centers Itself On Round; Square Or Irregular Shapes. Handles Stock Up To 2",Thick. Drill-hole Sizes Are 1/4"; 5/16"; 3/8"; 7/16" And 1/2". Six Hardened Steel Bushings" Are Provided: 2 Each of 1/4; 5/16" And 3/8". You Can Drill Two Identical Parallel Holes" Without Moving The Jig. Easy To Use! Item Is Brand New And Will Have Preservative Oil On It; This Is Normal. Instructions Can Be Emailed To You If Needed. Product Length: 4 3/4 Pr"