A grinding tool, in particular a concrete grinding tool, comprising a drive spindle driven by a motor in the working rotational direction having a tool receptacle at its free end. Various attachment systems for installing a synthetic covering are described. Instead of having subscribers to call into customer service centers to take advantage of these new lower international calling rates, the new calling rates will be updated dynamically and immediately for subscribers without these subscribers having to call in to request their billing rates to match the new calling rates. Dielectric material separates the source and the drain from the gate, and the control gate from the first charge storing layer, the second charge storing layer and the gate. After crosslinking of the structural polymer has taken place, the template polymer may be removed to form the finished microspheres.