Crank bolts are notorious for requiring serious muscle power to remove for servicing. Using tools that work with you is vital if you want to work smarter, not harder. The Powerbuilt, 3 Piece Crank Bolt Socket Set are counter-weighted sockets specifically designed to remove stubborn or ceased crankshaft bolts from almost any engine when using a 1/2-inch impact gun. The set includes 17mm, 19mm, and 21mm size 6 point sockets to cover most passenger vehicles. The sockets are tough impact-rated Chromoly steel for long tool life with a lifetime warranty. This three-piece set comes in a rugged, heavy-duty carry case for easy storage.