Part Number: PT-AF-2GT-60T-19B-6-A 2GT 60 Teeth Aluminum Timing Pulley, 19mm Center Bore Diameter, with 4 Flat Holes Lubrication-free, Low Noise, Wear Resisting, Precise Tooth Pitch Strong Corrosion Resistance, Lighter Weight Can install two F6800ZZ flange bearings to share radial force Rotates under heavy load