Designed for "V" routing and beveling edges. Insert "V" cutters have 3 separate parts: the head, the blade, and the arbor or shank. Each head comes with a replaceable blade, however, the arbor must always be ordered separately. These tools are most cost effective when you have a lot of the same angle to do. When selecting an angle refer to chart at the right. A 90° tool will give you a 45° bevel, and a 45° tool will give you a 22.5° bevel.