There are three different ways to configure the arbors
1. This one-piece arbor will fit in a 1/2" chuck. The hole saw arbor can hold any size hole saw to 1 1/8". You need an adapter (we sell one on this web site) for larger hole saws. The 1/4" hex arbor can hold any tool with a 1/4" hex shank. Such as spade bits, screw tip holders, drill bits, etc.