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