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Aluminum Big Pulley:90 Teeth,12mm Bore,Dimensions:90MM*25mm Aluminum or Steel Small Pulley:15 Teeth,6.35mm Bore,Dimensions:25MM*20mm Small Pulley With Top Screws For Nema23 2-phase Stepper Motor(6.35mm Stepper Motor Shaft only) If you need the 8mm bore for 8mm Stepper Motor Shaft,please let us konw when you place your order.thanks! Belt Model:3M-336(3M-306 Optional) Two shaft center distance : 80MM (3M-306 center distance 64MM) Reducer Ratio 6:1 Pitch : 3M What is in box ? 1 X 3M Timing Pulley Belt Set