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Spur gears have a second (smaller) gear. For clarity all spur gears have the number of teeth listed for both larger and smaller gears.
These white spur gears with the 2.9 mm dia. hole are a press fit on to the 3.0mm diameter rod.
These gears are available in packs of 10 (Code: GEAR64/12/2.9-10) and packs of 50 (Code: GEAR64/12/2.9-50).