HTD 5M Idler Timing Pulley 15T Bearing Bore 3mm-9mm for 15/20mm Belt 3D Printer
Inner hole: 3mm，4mm，5mm，6mm，7mm，8mm，9mm. Applicable belt: 15mm 20mm wide 5M-type timing belt. Uses: used to adjust the tightness of the timing belt. Number of teeth: 15. Tooth pitch: 5mm.