Features and Benefits:

• Reverse spiral flutes engineered to provide maximum gripping power to easily remove broken, damaged, or rusted nuts, bolts and screws
• High carbon steel ensures longer life and greater durability
• Universal lobular design fits all types of fasteners
• Size hard stamped on the tool for easy identification
• Set comes on a magnetic rail

This 6-piece Bolt Extractor Set comes with sizes:  9/16", 11/16", 3/4", 3/8", M13 and M17.  They are for use with 1/4" or 3/8" or 1/2" drill/driver or socket wrench