1. Resists a socket pull-off load.
2. Prevents accidental socket loss.
3. Instantly unlocks by retracting the knurled ring.
1. 1/4" Dr., 3/8" Dr., 1/2" Dr. 2. For specific information, please check our official website: http://www.tien-i.com/h-accessories_universal-ma.html 3. Magnet strength: 1/4" Dr.: 0.45lbs, 3/8" Dr.: 0.9lbs, 1/2" Dr.: 1.35lbs.