This guillotine style angle cutter quickly and cleanly produces (3/12, 4/12, 6/12, 8/12, 10/12 or 12/12) roof pitch cuts, and most other angles, in 5/16 In. (8 mm) fiber cement siding. Scribe any angle pitch on the fiber cement siding plank and feed it into the guillotine blade as you cut. The blade is anchored above the cutters large work plate to allow clearance for cutting angles in siding planks up to 12 In. (305 mm) wide. For simply cutting planks to length, a 90-degree fence installs to the left or right of the blade. Just loosen a knob to swing the fence out of the way when making angled cuts. The angle cutter may be mounted on saw horses up to roughly knee level and still allows the operator to work over the tool for plenty of leverage. Elevating the angle cutter will require the plank to be supported. The cutter also operates on the ground which eliminates the need for support.