Ideal for aligning holes in metal pieces through which rivets, pins or bolts are inserted not for use when driving pins, rivets or bolts black oxide finish for resistance against corrosion american made product mayhew stands for quality, dependability, and confidence. when the caliber of the tools is just as important as the skills of the professionals employed, businesses trust mayhew to get the job done. the 5/32 line-up punch is used to align holes with ease.