Designed for quick, easy removal of left or right-handed broken screws, bolts, studs or other threaded forms Drill bit sizes to be used are stamped on each extractor A hole is first drilled in the broken stem and the right size Williams extractor is then inserted Made in the USA Set Features JHWEX-21A, JHWEX-21B, JHWEX-22A, JHWEX-24A, JHWEX-25B, JHWEX-25A