Kreg jig has a patented 3 Hole removable drill guide ensuring that maximum accuracy can be achieved and also that holes drilled into a wide variety of material widths and thicknesses. The K4 Jig has hardened steel at its core and this shrouds the bit and supports the work piece through 100 percent of the drill-stroke minimizing deflection, reducing tear out and creating a clean and pluggable Pocket Hole at the end. This jig has a large clamping recess making it easier to secure the jig to the workbench and the rear mounting clamp design ensures rigidity while holding the work piece. Kreg Jig K4 is the perfect choice for do it yourselfers and anyone new to pocket hole joinery. Whether you are building your first set of garage storage shelves or making simple repairs around the house, the Kreg Jig K4 can help you finish the job in less time, and with far less effort than you ever thought possible.