Great projects start with high-quality cuts, and you can make those cuts-more easily than you ever imagined-using your circular saw plus the Rip-Cut Circular Saw Edge Guide. The Kreg Rip-Cut turns your circular saw into a precision edge-guided cutting tool that makes straight, accurate, repeatable cuts in plywood, MDF, and other large sheets. With the Rip-Cut, you can cut w/ the confidence you want and the precision you need. The Rip-Cut easily makes straight, accurate, repeatable cuts without measuring, marking, or having to keep the saw on the cut line. The Rip-Cut does this with a long edge guide that follows the straight edge of the sheet you are cutting. So, all you have to do is lock the saw in at the measurement you want-up to 24"-using the built-in measuring scale, and then make your cut.