The Ko-ken 72T Z-Series Ratchet combines a low backlash, small size, and has a 10 percent higher torque limit in comparison to the company's 36 tooth ratchet. Whereas the 36 tooth ratchets move 10 degrees/click, the 72 tooth ratchets move 5 degrees/click. The 72T also features a dual pawl design that utilizes a single spring. Available in 3/8".