Faster easier slug removal. Drill pilot hole without saw, one. Eliminates the bit when saw crashes into the steel. Provides better ergonomics reduced 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.