• Knurled shank for finger turning of free running fasteners • Applicable to nuts and bolts used in the aerospace industry • Not suitable for machine operation or power tools • Highly polished finish • High-performance alloy steel • Less wear of the fastener thanks to Dynamic-Drive™ profile • Maximum load distribution and torque from the additional flank area • Thin walled for better accessibility • Standards: ISO 2725/1174 and DIN 3124/3120