Features: 

• Bi-directional design for removing or tightening damaged fasteners.
  
• Tapered entry grabs onto damaged fasteners with ease.
  
• High-visibility laser etched markings provide quick size identification.
  
• 1/4" hex shank is compatible with impact drivers and drills.
  
• Strong magnet for holding fasteners securely in place.
  
• Black oxide finish to resist corrosion.
  
• Sizes included: 1/4in, 5/16in, 3/8in, 7/16in and 1/2in.

Details: 

The new Crescent Bolt Biter impact nut driver and extractor is the ultimate tool for driving and extracting hex head fasteners of any condition, whether new, worn, rounded, rusted, or damaged. The revolutionary tapered socket design engages with the fastener on the first try and eliminates the frustration of working with old or damaged fasteners.