-Tempered Chrome Molybdenum Steel
-Removes Broken Screws, Bolts, and Studs Without Damaging Bolt or Hole Threads
-Extractors have Round Flutes
-5pc Screw Extractor Sizes: 1/8"-1/4", 1/4"-5/16", 5/16"-7/16", 7/16"-9/16", 9/16"-3/4"
-Includes a Plastic Storage Case