The Diablo nine-piece hole saw kit features five bi-metal hole saw cups, one-piece SnapLock PLUS mandrel, one pilot bit and two adaptor nuts (1/2 and 5/8 in) for quick and easy hole saw cup changes for maximum job performance. This new, high-performance hole saw set delivers faster cutting performance and increased productivity versus standard bi-metal hole saws. Unlike anything on the market, Diablo's hole saws and SnapLock Plus mandrel system simplify the attachment process for fast and efficient hole saw mounting.