3M-16T Step Timing Pulley Bore 4-8mm Synchronous Wheel for Reprap 3D Printer CNC

3M-16T Step Timing Pulley Bore 4mm-8mm for Width 11/16mm Belt Reprap 3D Printer. Aperture: 4mm，5mm，6mm，6.35mm，7mm，8mm. Number of teeth: 16.

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