This is a small Pulley for a Nema 17 Stepper Motor ….. It is Press Fit No Set Screw Required…. I am using it for tests so I am using O-rings as belts and have also used rubber bands. Basically just using it to test functionality on a project. The OD of the Pulley is 17/32 (.531) rather small but it works for what I'm testing. If You have a need for a bigger one or a different type let me know perhaps I can help.

Thank You,

Happy Printing!