A set of four different-sized gears (ranging from 12-, 20-, 30-, and 40-teeth) with holes to attach to each other with screws. Small gear fits toy motor shafts. New durable plastic material. Black, Set of 4.
Will work with these gears: 390622, 390626, 390585, 390633, 390634, 390635, 390636, 750112, and 990174.
