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