These are the revolutionary new HSS spiral knife that gives incredible finishes! Introduced by Powermatic, we now offer the knives for the Powermatic or ACCURA planers of this style. These are a 3 piece set of disposable HSS. The advantage to the spiral knife is that the knife never leaves the wood, thus allowing for glassy smooth finishes. Please note these only work in the head designed for them. Cheapest shipping method is by USPS Flat Rate.