Article description Hexagon drive ISO 1173 C6,3 (1/4?), ISO 2351-3 C6,3 Made in Germany Drive: 1/4 inch (6.3 mm) solid hexagon Output: Internal hexagon profile Wrench size: 5 mm Dimensions / length: 25 mm Net weight (kg): 0.01 kg For manual and machine use Special steel for the highest demands The highest dimensional accuracy for grinding and cutting Both for electric or pneumatic screwdrivers and for manual use Tough-hard for bolts (hard screw case) Permanent hardness of 59-61 HR C for strict requirements in industry and trade High torque values, far above the DIN standard, with long service life