The Diablo 14-Piece Hole Saw Kit features ten (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. This set includes a heavy duty, durable case for easy and convenient storage of hole saws.