KO-KEN RATCHETS Ko-ken ratchets are known for their very low backlash, small head sizes, and high torque ranges.  We designed the new 72 tooth ratchet without compromising on our traditional strengths.  The patented design of the 72T combines the low backlash, small size, and has a 10% higher torque limit in comparison 1/4" Body 3/8" Sq. Dr. Ratchet 72 teeth Length 160mm Z-series