Signswise CNC Engraving Machine Accessory 3m Timing Pulley Belt Set Kit Reducer Ratio 6:1 CNC Engraving Machine Accessory 3m Timing Pulley Belt Set Kit Reducer Ratio 3:1 Aluminum Big Pulley:90 Teeth,12mm Bore,Dimensions:90MM*25mm Belt Model:3M-336(3M-306 Optional) 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) FREE SHIP from China via ePacket, usually takes about 10-15 business days for the delivery