Here are two adapters for Scotch Brite wheels in different thicknesses. The adapters are for a 1.0 inch inner diameter Scotch Brite wheel with a thickness of 0.25 inch and the other adapter for a thickness of 0.30 inch.
The center hub is 0.50 inch which allows either thickness to be mounted on a standard grinder machine to be used for polishing metal works, knives or other tools.
Scotch brite wheels are great for polishing and removing imperfections like rust and grime from metal surfaces.
This is used as a hub for the Scotch Brite wheel and it keeps it centered and spaced correctly on your grinder shaft. To prevent compression it is recommended that you use an infill of 50 to 100% for PLA material.