If you are planning to build a patio but are not satisfied with decking with visible screws, AnglePro is here to help. This tool is a true master of hidden fasteners. It allows you to fix the decking boards so that not a single screw is visible from above. You can adjust the spacing from 3 to 7.6 mm. Whether you're working with narrow 85mm wide boards or wide 150mm boards, AnglePro can handle both. Precise guides help you quickly and accurately drive screws at the right angle. It has a reinforced handle. Important - AnglePro works with special GRK AnglePro Hidden Deck Fastener 9 x 2-3/8” screws.