PROXXON 28782 ball grinding stones
Proxxon lists the 28782 as a corundum grinding accessory in its MICROMOT family.
How to choose
A ball head gives a curved contact surface for a confined spot. Match the working size and specified shank before choosing it for the documented material.
Compatibility and limits
Three corundum ball grinding bits · verify individual head dimensions
Questions before buying
What makes a ball stone useful for a curved recess?
The rounded contact gives you a different working surface from a tapered stone. Compare the 953 taper if the opening narrows along its depth, and match each model to the intended material.