Product description:
Type: 4mm U/O groove drive wheel

-Diameter: 20mm 30mm 40mm 50mm
-Groove width: 4mm (for 4mm wide strap)
-Material: Aluminum alloy
-Mounting screws (free)
-Smooth drive/high precision.
CNC precision machining/easy assembly.
-For PU round belts
-Wide range of applications: motors, miniature spindles, model gear construction.

Package Included: According to your choice!