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75 mm dia. Driving and output pulleys with 20 mm dia. Intermediate pulley is fiited on 16 x 16 cm base. For use in driving dynamos, line shafts, flywheels, pumps etc. The driving and output pulleys are both 75 mm diameter and the intermediate pulley is 20 mm diameter giving a step-up ratio of 3.75 Size 16 x 16 cm