Value Collection 28MP012-6FA-1/4 Timing Belt Pulleys; Pulley Type: Hub & Flanges; Number of Teeth: 28; Outside Diameter (Decimal Inch): 0.6930; Material: Aluminum; Pitch Diameter: 0.713 in; 0.713 mm; Face Width: 0.26 in; 0.26 mm; Flange Diameter: 0.8