BlueSpot 3/8 Impact Stud Extractor 22307 Manufactured from carbon steel for increased durability. Ideal for removing broken, stripped and rusted studs as well as threaded rods and broken bolt shanks. The impact stud extractor is fully adjustable to fit studs between 1/4 to 1/2 (6-12mm). Can also be used with a 3/8 ratchet, 24mm spanner or an impact driver on a low power setting. Fit studs from 1/4 to 1/2 (6-12mm) This high quality Impact Stud Extractor comes to you brand new with retail packaging/tag This is a perfect addition / replacement to any toolbox or workshop For the manufacturers lifetime guarantee you just need to register online with BlueSpot Tools within 30 days of purchase.