Also known as stile and post shaper cutters.
Carbide Tipped Tongue & Groove Mission Style and Arts & Crafts Reversible Stile and Rail Shaper Cutters for 3/4" Material
Designed for template shaping such as arched or cathedral doors, etc. Features a ball bearing center with a steel sleeve and isavailable with either 1/2", 3/4" and 1-1/4" inside diameter.