Precise, versatile, and easy-to-use are the words which best describe the Incra 12-Inch Precision Marking T-Rule. Think of it as a combination square for marking or measuring thats simultaneously set to every scale position with perfect, instant accuracy. There are micro-fine marking holes and slots at every 1/16-, 1/32-, and 1/64-inch scale position to instantly locate your sharp pencil or scribe exactly on target with zero uncertainty. The Incra T-Rule makes it very easy to draw exact lines in either direction, and with zero uncertainty and no eye strain. Other features include 0- to 3-inch height markings on the end in 32nds, and the option of marking holes every 1/100-inch.