Brass motor pulley for output shafts with a 3 mm dia. Overall dia. Is 10mm, overall width 9mm. Unlike brass pulley 4602-082, this pulley has a grub screw fixing. Sold individually. Ideally use with 2.5mm round rubber belts. We sometimes find the 3mm bore to be a bit under-sized so choose the custom bore size if bore is critical and you are not able to do it yourself.