This pulley is compatible with 6mm wide GT2 2mm pitch timing belts. It's an ideal match for the GT2 pulley-belt sets we sell. The idler is a good choice for the 20T GT2 timing belt pulley driven by a stepper motor.
The Belt Actuator Kit comes with the Openrail 40mm gantry for large base and it provides smooth operation for a Gantry along a 20×40 V-Slot Linear Rail. It is both accurate and quick, ideal for industrial applications. This Kit includes a Nema 17B Stepper Motor! This kit is an easy way to get all the pieces needed for the build. You'll have everything you need to get up and running in no time.