This pulley is used for small motors with 2-mm shaft. The diameter of the bore (center hole) is 1.95 mm so that it can make a snug connection with 2-mm shafts.
Outside diameter is 9.3 mm and the diameter inside the groove is 6.5 mm. Overall thickness of the pulley (Width) is 4 mm. The belts (string or rubber bands) with thickness of 1 to 2 millimeters may be used with this pulley.
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As advertised, specs were nice to have when deciding f I could use this. It worked great for repairing a battery powered soap dispenser. It is too bad the parts cost more to ship than the parts themselves. Would be nice not to have to buy 10 as well, maybe 5? I only needed 1.
Works great for the application they are used for.