The Diablo 14-Piece Hole Saw Kit features five (10) bi-metal hole saw cups, 1 piece SnapLock PLUS mandrel, 1 pilot bit and 2 adaptor nuts (1/2 and 5/8) 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, Diablos hole saws and SnapLock Plus mandrel system simplify the attachment process for fast and efficient hole saw mounting.