This Elliptical Jig enables the W1812 Shop Fox Planer/Moulder to make extremely high quality arched casings and moldings to match the same straight molding profiles produced by the Planer. Ideal for round top windows and arched doorways that are characteristic of custom woodwork. This jig requires a shop made 3/4-Inch thick template of the same arc or radius as the workpiece. Maximum width capacity is 6-1/2-Inch curved moldings if they have a radius greater than 7-Inch and a minimum length of 9-Inch.