Carbide hole saw multi-purpose Profit® - Click & Drill system for quick hole saw change. Easy enlargement of a hole by attaching a larger drill bit. The small drill bit serves as a guide. Quick removal of the drill core. Suitable for all wood and panel materials (including solid wood), Trespa, plastics, plaster, aerated concrete, wall tiles, and masonry. Delivery: without centre drill. Note: Up to 10 times longer service life than conventional hole saws.