• 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.• Features specially machined flutes in the walls of the socket to enable use on up to 85% rounded fasteners. • Suitable for use with air/electric impact guns.• Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 27, 30, 32mm.• Supplied in storage case.• Lifetime guarantee*.Manufactured from Chrome Molybdenum steel with manganese phosphate finish for added corrosion resistance. Features specially machined flutes in the walls of the socket to enable use on up to 85% rounded fasteners. This not only provides added strength but also prevents damage to worn or rusted fixings. Suitable for use with air/electric impact guns. Supplied in storage case.• Manufactured from Chrome Molybdenum steel with manganese phosphate finish for added corrosion resistance. • Features specially machined flutes