? Cratex Blocks & Sticks ? Excellent for cleaning and polishing metal surfaces, for breaking edges, smoothing away high spots, removing rust, heat marks, tarnish and stain ? Designed for either manual or mechanical application ? Can be mounted in tool holding fixtures, chucks, or cradles ? Use them for polishing commutators, damaskeening, cleaning and dressing diamond wheels, highlighting steel rules, calibrations and reference points, and for removing feather edges and "touching up" cutting tools, dies, chisels and other edged tools