72 TEETH REVERSIBLE QUICK RELEASE STUBBY RATCHET WRENCH, 1/2" DR. Size: 1/2" DR., length: 135mm, weight: 420g Reversible 72 teeth head, the quick-release reversible head, replaced the socket by touching the middle part, and changed the driving direction by flipping the biased drive switch 1/2" drive is used for automobiles and motorcycles.