Certified faster than ordinary tools; get more jobs done, make more money. Instantly locks to other tools; no more accidental disconnects, dropped sockets or tools left in the work. One handed quick release. Compatible with existing tools. Lifetime warranty The patented LINK locking Universal Joint is an indispensable accessory when working in tight quarters. Gone is the frustration of falling tools just as you "pull out" of the work. Use the U-joint again with confidence that there'll be no irritating disconnects when working around corners. Combines with other LINK LOCK SOLID tools to make a custom tool that can get you into all those difficult to reach places with an ease that gets the job done faster and right the first time because none of the tools will come apart!