Milescraft 1319 JointMate. JointMate is a universal dowel jig for quickly and accurately creating corner, edge and surface joints with ease. Perform one-handed alignment and skip the hassle of measuring and marking when drilling corner or edge joints with JointMate. JointMate allows for quick and accurately doweled corner, edge or surface joints. With minimal set-up, and no exposed or covered mechanical fasteners, JointMate makes doweling easy. Self-Centering Posts. Depending on the dowel size you are working with, you can center your work piece on the corresponding busing, by using the simple, easy to use self-centering posts. Adjustable Guide Fence. Easily adjust to the depth of the board so that each hole will be precise from one to the next, when using 1/2″ to 1-1/2” thick lumber. Hardened Steel Bushings. Ensure accurate alignment when drilling for perfectly positioned dowels and ensure longer doweling life. Includes 3 sizes – 1/4”, 5/16”, 3/8”.