The 20% Thicker Fork Design Provides Extra Lift When Replacing Worn Out Ball Joints, Pitman Arms, Pickup Track Bars and Other Applications.The set includes five forks: 11/16″, 15/16″, 1-1/8″, 1-7/16″ and 1-5/8″. The forks are threaded to interchange with either the handle for hammering or the pneumatic driver (.401 Shank) and a 6-1/4″ extension that works with either handle to provide extra reach. The forks are heavy-duty forgings and the handles are heat-treated alloy steel.