-Tempered Chrome Molybdenum Steel
-Removes Broken Screws, Bolts, and Studs without Damaging Bolt or Hole Threads
-Extractors Have Tapered Flutes
-5pc Screw Extractor Sizes: #1-1/8", #2-3/16", #3-15/64", #4-1/4", #5-5/16"
-Includes a Plastic Storage Case