Hard tempered spring steel blades are designed for use with the ALL10770 and ALL10772 “All-In-One” Heated Tire Groovers. Blades are honed to a razor like finish and have a tapered shape making the blade wider near the top where strength is needed and thinner at the bottom, greatly reducing drag as the blade cuts through the rubber. Blades are sold in packages of 12. Note: All-In-One groovers must use these All-In-One blades but these blades can be used in any of our other groovers.