The Eastwood Screw Buster combines the hammering forces of a pneumatic hammer with the leveraged rotating force of a 4\" handle to loosen even the must stubborn fasteners without stripping out the slotted or Philips head screw. Loosens Rusted, Corroded, Undercoated, Painted and Over Tightened Screws Designed to be Used with a Standard .401\" Shank Air Hammer Must Have for any Shop or DIYer that works on Brakes, Restoration, or Heavy Trucks Tool comes with S2 tool Steel Impact Bits Reduces the Chances of Stripping out the Screw Head Has a standard 0.401 parker taper and fits most pneumatic hammers, The 5/16\" (8mm) hex bore accepts any common 5/16\" (8mm) hex drive bit in addition to the three popular included Philips. Contents: (1) - Eastwood Screw Buster (1) - #2 Phillips Bit (1) - #3 Phillips Bit (1) - #8 Straight-Blade Bit Air Hammer is not included.