1. Resists a socket pull-off load.
2. Prevents accidental socket loss.
3. Instantly unlocks by retracting the knurled ring.
1. 1/4” Dr.: 2”, 3”, 5”, 10” (inch). 2. 3/8” Dr.: 3”, 6”, 10” (inch). 3. 1/2” Dr.: 2”, 3”, 4”, 6”, 10” (inch). 4. For specific information, please check our official website: http://www.tien-i.com/h-accessories_extension-qu.html