· With knurling · Surface: chrome-plated, polished · DIN 3124, ISO 2725-1 · Made in Germany · Drive: 1/4 inch (6.3 mm) square, hollow · Output: Outside hexagon traction profile · Wrench size: 9 mm · Dimensions / length: 25 mm · Diameter d1 (output side): 13.4 mm · Diameter d2 (drive side): 12.5 mm · Net weight: 0.01 kg · For manual operation.