For Commutators and Brass or Copper Slip Rings
 
This is supplied with a wooden block handle, which allows the entire stone to be used when clamped in a lathe or portable grinder.
 
Quickly remove flat spots, high bars, grooves, ridges, high mica, and other commutator and slip ring defects.

Regular maintenance of commutators and slip rings with Martindale Commstones is so easy it enables you to eliminate the above defects in their early stages.

With Commstones, it is not necessary to take a machine out of service to resurface its commutator, therefore production time is saved and time-consuming major overhauls can be prevented.