The Perfect Miter attachment to the Kreg® stops references a 45 degree mitered board on two surfaces, greatly increasing the cutting accuracy and repeatability of the miter chop saw. Perfect for picture framers and any woodworker who desires tight fitting mitered joints. The Kreg perfect miter attachment secures to both the Kreg® Flipstop and Kreg® Production Stop with a single bolt and is reversible for toe-in or toe-out miter cutting. Knob and bolt are included.