Manufactured from Chrome Molybdenum steel with manganese phosphate finish for added corrosion resistance. Suitable for use with impact type air wrenches. Supplied in robust 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 robust storage case. Sizes: 26, 27, 29, 30, 32, 35, 36, 38mm. Lifetime guarantee*.