These 12 inches long impact sockets are for the jobs where extension bar isnt good enough to provide required stability and specified torques. Professionals will find these extremely handy when working on tractors, at engine bay, and car fender re-assembly, especially. Made of high grade Chrome Molybdenum and designed to last a life time and beyond. Come with a robust PE-HD blow mold case to ensure tidiness and accessibility for the users. Also available in individual packages.