The drive is initiated by a 72-tooth inner ring made of high-alloy special steel with just a 5-degree lever movement. Nevertheless, the transferable torque values far exceed DIN/ISO standards. The shafts are made of CrV steel with optimal surface protection: nickel-plated twice and matte chrome-plated once. The key sizes are clearly legible thanks to a laser marking process. The very pleasant self-locking feature of the joint, which is ideal for practical work, remains unaffected even after more than 10,000 operations. Its unmatched flexibility makes it perfect for tight and tricky situations.