Designed with the same tried-and-true efficient design and hardened-steel drill guides as the original Kreg Jig, the Kreg Jig HD lets you create joints in 1-1/2 in and thicker materials that are an amazing 50% stronger than traditional Kreg Joints. If you are framing walls, building deck railings, outdoor furniture or any other large project, you always want the strongest joint possible and this is where the Kreg Jig HD excels - strength. It utilizes #14 heavy-duty, hardened-steel screws that provide incredible shear resistance, as well as three anti-corrosion layers for incredible long-term moisture resistance.