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The Pololu Wheel Pair for Micro Servo Splines (21T, 4.8 mm) 60 x 8 mm (Black) plastic wheels have silicone tires and measure 40 mm (1.57 inch) in diameter. They mount onto micro servo splines with 21 teeth and a 4.8 mm diameter.
The wheel presses onto the servo spline just like a typical servo horn, and the small screw included with the servo accessory pack for mounting servo horns should be used to hold the wheel in place.
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