HM Hole Saw Multi Purpose PROFIT® - Click & Drill System for quick hole saw changes. Easily enlarge a hole by attaching a larger drill bit; the smaller drill bit serves as a guide. Quick removal of the core. Suitable for all wood and panel materials (including solid wood), Trespa, plastics, gypsum, aerated concrete, wall tiles, and masonry. Delivery: Without centering drill bit. Note: Up to 10 times longer service life than conventional hole saws.