The Diablo 17-Piece Hole Saw Kit features five (11) bi-metal hole saw cups, 2 SnapLock PLUS mandrels, 2 pilot bits 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, Diablo’s hole saws and SnapLock Plus mandrel system simplify the attachment process for fast and efficient hole saw mounting. Sizes included : 1-1/8″, 1-1/4″, 1-3/8″, 1-1/2″, 1-3/4″, 2-1/4″, 2-9/16″, 3″, 3-5/8″, 4″, 4-1/2, 2 Mandrils, 2 Pilot Bits, (2) Adaptor Nuts.