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 18 mm and the diameter inside the groove is 16 mm. Overall thickness of the pulley (Width, near the center) is 6.3 mm. The belts (string or rubber bands) with thickness of 1 to 2 millimeters may be used with this pulley.
Sold in packs of 10.
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The Company deserves a perfect 10 star rating based on their helpfulness, quickness for shipping the product and being a good human being. The product deserves the 3 star rating as it was not well made. I would say that as long as the RPM's were not too high the pulley should work well, just too many moding burrs left on the product. I would order from this vendor in the future!