Jumbo impact sockets, these are built for harsh industrial working conditions. These super heavy duty sockets are made of high-grade Chrome Molybdenum alloy and built to last throughout ones professional career, and maybe farther. The flank design is meant to deliver maximum torque for all kinds of jobs without having chances of stripping and wearing damages to fasteners. Always insert a retaining pin and a locking O-ring to secure the sockets while operating a 3/4 impact wrench. A robust metal case is included for easy storage and transport.