Stud socket M16 - For thread-conserving installation and removal of stud bolts, threaded rods and hanger bolts - Suitable for right and left hand threads - No damage to the thread in comparison to welding on auxiliary materials or using pliers - Turning without laboriously locking two nuts on the bolt - Safe grip due to three internal rolls - Use with square 1/2" or hex 21 mm wrench - With external hexagon SW 24 mm (M14 - M16)