Center-Locating Punch For Threaded Holes Self-Aligning Size 1/2 -20

Self-Aligning Center-Locating Transfer Punches for Threaded Holes

Also known as transfer screws, these punches have a uniform shoulder height so you can quickly transfer multiple hole locations at once. Thread the punches into closed-end holes and tighten with pliers or a wrench, then strike the workpiece with a hammer to mark the holes.