Our stud-outs are a screw, stud and pipe extracting tool which perform similar to a screw extractor or EZ-Out. They are made from super premium square style forged high carbon steel for high strength and durability. The unique square shape allows this extractor to remove broken bolts, screws, and pipes with minimum damage to the broken part. To use, a hole is drilled in the end of a broken part using a left-hand drill bit, and then the stud-out is inserted and turned counterclockwise using a wrench to turn out the broken part. Recommended drill size is 5/16". Made in the USA by Norseman Drill & Tool.