Screen Frame Notching Jig and Tool Assembly notches roll-form screen frame for the installation of tension springs, slide locks, and knife latches. The grooved wooden jig holds 1/4, 5/16, 3/8, 7/16 and 1/2 inch screen frame securely while you notch the metal with the notching tool, which is included. It is extremely simple, easy to use and a real time saver.