Q1: What is the main function of this wheel? Is it a drive wheel or a contact wheel?
A: This product is a dual-purpose wheel. It can serve as a Drive Wheel (connected to the motor to power the sanding belt) and a Contact Wheel (which the sanding belt runs against and applies pressure to the workpiece). The key feature is the precision bearing inside, ensuring smooth rotation and efficient power transmission.

Q2: Is the bearing included and pre-installed? What type of bearing is it?
A: Yes, a high-quality, pre-lubricated and sealed ball bearing is already pre-installed in the wheel hub. This bearing is designed to handle the high speeds and lateral pressures common in belt grinding applications.