A set of [4] different-sized gears (ranging from 12-, 20-, 30-, and 40-teeth) with holes to attach to each other with screws. The large gear measures 1-5/8 in. dia. The small gear fits 2mm motor shafts. Other gears fit 3mm shaft. Durable plastic. Green.
Will work with these gears: 390622, 390626, 390585, 390633, 390634, 390635, 390636, 750112, and 990179.
