Our new heavy duty crankshaft sockets feature .350" wall thickness, and are machined from a solid piece of billet steel for an exact fit on the snout of a Big Block Mopar crankshaft. These are great for degreeing cams, turning the crank during engine assembly, adjusting valves, etc. Use with any standard 1/2" drive breaker bar or ratchet, etc. Another one of those super rare tools that every Mopar guy should have in their box. One part number includes ONE socket, the picture is to show front and back view.