Uxcell a13123000ux0543 75mm Dia XL Type 0.43" Width Timing Belt Pulley 44 Tooth 1/5" Pitch, Copper Product name: timing pulley; material: aluminum; color: silver tone Number of tooth: 44T; pitch: 5.08Mm/1/5 inch Bore diameter: 10Mm; top diameter: 53Mm/2.1 inch