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 mat