• A7402DM 3/8" square drive sockets bi-hex profile metric 8, 10, 11, 12, 13, 14, 17 and 19 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 2725-1/1174-1 and DIN 3120