The Kreg® Jig® K4 is the ideal choice for do-it-yourselfers and anyone new to pocket-hole joinery. The 3-hole drill guide lets you make ideally placed pocket holes in a wide variety of material widths and thicknesses from 1/2 to 11/2 in, 1/8 in increments. Every Kreg® Drill Guide features a hardened-steel core that carries a lifetime assurance. The core shrouds the bit and supports the workpiece through 100% of the drill-stroke, resulting in minimal bit deflection, reduced tear-out and a clean, pluggable pocket hole. The Kreg® Jig® K4's rear-mounted clamp design has been around since the first Kreg® Jig®. Its proven design offers incredible rigidity and uncompromising workpiece holding strength. Adjustments are as easy as releasing the locknut and rotating to the correct setting.