These are also called swivel sockets that provide large working angles while retaining impact property. Mechanics can easily access to those hard to reach nuts and bolts with speed and precision. Made of high grade Chrome Vanadium and specially heat tempered, they are guaranteed to meet ANSI standard and beyond. The black phosphate finish offers outstanding corrosion resistance while giving non-slipping surface texture. All 7 sockets are size-orderly placed on a peg-holed premium rack for easy size selection and effortless storage.