Cut neatly along the guide rail to ensure a seamless fit between the board and the mountain wall, avoiding wind and rain from entering the interior of the house through the gaps This adjustable, high - precision tool is engineered to capture and accurately cut those hard - to - measure gable angles ranging from 0 to 90 degrees in fiber cement siding and paneling. It offers quick and effortless operation, thanks to its lightweight aluminum build. Instrument is designed to precisely measure the angle formed between the horizontal plane of the ceiling wall line and the diagonal of the roof joists. By doing so, it facilitates a single, expertly executed cut that effectively eliminates any unwanted and aesthetically unpleasing gaps. Our innovative two-in-one angle gauge is engineered to be compatible with a diverse range of cutting tools. It features a precision-crafted guide slot, specifically tailored for seamless integration with PacTools handheld shears. This design enables users to achieve straight and highly accurate cuts that flawlessly align with the gable's contour Position the tool within the gable, fine - tune the angle to be captured, secure the fastener firmly, and then transfer the measured angle to the workpiece. The outcome is a uniform and expertly executed finish. Our product has undergone multiple upgrades and improvements on the original basis, correcting the problem of inconvenient use and easy wear of the product knob. And to prevent the knob from being lost, we have also prepared a set of replaceable knobs and screws for you. SA904 Angle Measuring Tool 30 Inches Aluminum/Steel Construction with Handy Guide-Slot for Snapper Shear Side Knives, for Dust-Free Snapper Shears