SAN MIN GEARS T2.5 timing belt pulley pitch 2.5mm Type Available for Characteristics Anodized Aluminum Pulleys increased chemical and corrosion resistance available in natural, black, or colored limited increase of surface hardness Hard Anodized Aluminum Pulleys excellent chemical and corrosion resistance increased surface hardness Black Oxide Steel Pulleys increased chemical and corrosion resistance aesthetic treatment Zinc plated Steel Pulleys increased corrosion resistance Chromate Steel Pulleys increased chemical and corrosion resistance Size range: Teeth Number from 9 to 216; O.D. from 10mm to 1000mm;