HTD 5M Timing Belt Pulley 15mm Width 405mm Belt 60 Teeth 20Teeth 3:1 Ratio Synachronous Pulley 5mm 6mm 8mm 10mm 12mm 14mm 15mm 16mm 19mm 20mm 22mm 24mm 25mm Transmission Pulley (60T-12mm, 20T-14mm)