From Master Craftsman Brian Russell, the set includes one 4-flute left hand cutter (through tapped), and seven 9″ long pilots (.075″, .078″, .085″, .094″, .103″, .109″, .112″). The pilots are hinge rods that thread into the cutter. The cutter does its job while being pulled into the work (post or key). Excellent for facing posts while mounted on the instrument. Can be operated in bench motor for major cuts, or with a hand chuck for fine adjustments.