Delta Sliding Shaper Jig 3-188 Provides greater cutting accuracy for a variety of shaping or table saw operations. Features three guide bar locations for positioning the workpiece as close as possible to both large and small diameter shaper cutters. Twelve mounting holes offer you a dozen options for moving the solid steel bars and cam-action clamps around the base in order to fit large and small work pieces, different machines and various types of operations. Thru-holes let you mount a back-up board to the miter gage for providing additional work support at the cut.