The Irwin Cordless Multi-Purpose Drill Bits have been designed for cordless low min multi-purpose drilling In tests they produced between 90-129 more holes per battery charge than leading competitors They have a four-facet ground carbide tip for lower drilling pressure and better centring and allow for combined drilling into wood and brickwork the Cordless Drillbit is excellent for such drilling jobs - where you drill through wood into brickwork Only one drillbit is needed to do the job and will drill a wide selection of different materials like Brickwork Ceramic Tiles Breeze Block Wood Dry Wall Gypsum Board Limestone Slate Marble Eternite and PlasticsReinforced plastics