Quick Change Hole Saw Kit. New arbor allows for rapid mounting or removal of hole saws. Faster, easier slug removal. Drill pilot hole without saw. Eliminates the "bite"" when saw crashes into the steel. Provides better ergonomics - reduces stress on wrist, arm and hand. Eliminates obstructed view from hole saw. Only one arbor required from 7/8" to 6" (7/16" shank recommended for hole saws above 2-1/2"). Works with recessed light and carbide grit hole saw products as well. Adapters re-usable to minimize costs. Universal - works with any brand hole saw. Kit contains Bi-metal holesaws for 1/2" - 2" conduit sizes.