Uxcell a13071200ux0235 Silver Tone Aluminum Alloy XL Type 12 Teeth 6.2mm Pilot Bore Timing Pulley, 0.98" Width, 0.25 Metal, Rubber Product name: timing pulley; type: xl; tooth number: 12 Pitch: 5.08 mm/ 1/5"; bore diameter: 6.2 mm/ 1/4"; outside diameter: 14 mm/ 0.55" Fit belt width: 11 mm/ 0.433"; overall size: 25 x 25 mm/ 0.98" x 0.98" (d*h)