Center distances from 3" to 12"Single reduction from 3-1/9:1 to 95:1 -- up to 169

 hp; up to 145,000 in-lbs output torqueDouble reduction (helical worm) from 32:1 to

 394:1 -- up to 58 hp; up to 145,000 in-lbs output torqueDouble reduction (worm-worm)

 from 25:1 to 394:1 -- up to 33 hp; up to 145,000 in-lbs output torque