This four-pack of 8-tooth injection-molded sprockets comes with two idler sprockets (with 1/4" holes) and two sprockets with 3-mm hexagonal holes (for use with Tamiya Gearboxes that have 3-mm hex shafts). The track links and pins are sold separately.
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These 8-tooth, injection-molded sprockets are made to work with the rugged miniature tank tracks. This set comes with four sprockets made from sturdy, black ABS plastic: two sprockets for mounting on the 3-mm hex shafts found in many Tamiya Gearboxes, and two idler sprockets with 1/4" holes that you can mount using shoulder bolts.
The diameter of the sprocket by itself is 1.5". Once the rugged miniature tank tracks are around the sprocket, the total diameter is roughly 1.77".
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