Manufactured from Chrome Molybdenum steel with manganese phosphate finish for added corrosion resistance. Deep WallDrive® sockets, suitable for use with impact type air wrenches. Supplied in storage case. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Manufactured from Chrome Molybdenum steel with manganese phosphate finish for added corrosion resistance. Deep WallDrive® sockets. Suitable for use with impact type air wrenches. 8pc Set supplied in storage case. Sizes: 24, 27, 30, 32, 33, 34, 36, 41mm. Lifetime guarantee*.