The 72-tooth inner ring made of high-alloy special steel allows for drive engagement with just a lever movement of 5 degrees. Nevertheless, the transferable torque far exceeds 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 due to a laser marking process. The self-locking feature of the joint, which is very pleasant for practical work, remains unchanged even after more than 10,000 operations. Its flexibility is unmatched when working in tight and tricky spaces.