Chrome Molybdenum steel impact sockets with 1/2"Sq drive. Phosphate finish for added corrosion resistance. Suitable for use with any impact tool. Supplied in storage case. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Chrome Molybdenum steel impact sockets with 1/2"Sq drive. Phosphate finish for added corrosion resistance. Suitable for use with any impact tool. Sizes: M8, M10, M12, M14, M16, M18. Supplied in storage case. Lifetime guarantee*.