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OUT OF STOCK UNTIL LATE MARCH - Check out 990179
A set of  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 diameter. The small gear fits 2mm motor shafts. Other gears fit 3mm shaft. Durable plastic. Please note picture shows assorted colors but all gears are green.