Manufacturer suggested retail price. $43.10 Features and Benefits: Works with most popular tools: 1/4 in. shank for use with cordless drills, impact drivers, corded drills and nut runners. Power groove allows for use with quick change adapters Maximum gripping power: reverse spiral flutes are designed to bite down Shear resistant shank: High carbon steel shank is larger than most fastener shanks and resists torsional shear Grips both metric and SAE: Universal Lobular design fits both sizes Black Oxide finish with white markings: prevents rust and has easy to read markings Easily removes damaged screws and bolts (stripped, rusted and broken) Includes: 1/2 in., 7/16 in. (11mm), 10mm, 3/8 in., 5/16 in. (8mm), 1/4 in. and 3/16 in. Packaged in a blow molded case Manufacturer: Irwin Industrial Lifetime warranty does not cover abuse