The Irwin Cordless Multi-Purpose Drill Bits have been designed for cordless low speed multi-purpose drilling They offer around 10 extra battery life per charge 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 PlasticsReinforced plastics