• A7400DM 3/8" square drive sockets bi-hex profile metric 7, 8, 10, 11, 13, 15, 17, 19 and 22 mm • Knurled shank for finger turning of free running fasteners • Applicable to nuts and bolts used in the aerospace industry • Not suitable for machine operation • Highly polished finish • High-performance alloy steel • Less wear and damage to fastener thanks to Dynamic-Drive™ profile sockets • Thin walled for better accessibility • Maximum load distribution and torque from the additional flank area • Standards: ISO 2725/1174 and DIN 3124/3120