Biesemeyer 78-931 T-Square Home Shop Fence (Universal) 40-Inch Right/12-Inch Left For Table Saws Predrilled to fit a variety of table saws 40-inch right, 12-inch left capacity for a variety of applications Hairline pointer allows easy, precise reading of distance 3-point locking system for parallel alignment to blade to 1/64-inch Built in tape for easy set up