Hand-held Skate Sharpener. Quick and easy to use - Simply slide along runner. Immediately adjustable to fit all skate blade widths and hollows. SkateMate has a patented flexible abrasive sharpening cylinder that sharpens with respect to the runner's radius. The special ceramic-embedded abrasive used in SkateMate's cylinders is the second-hardest material on the face of the earth. Only pure diamond is harder. Internal Teflon Glide Strips - Provide for a smooth sliding action up and down the blade. External Deburring Strips - For a professional job, after sharpening, deburr sidewalls in few more strokes. Skatemate prolongs a skate's sharpness - SkateMate does not wastefully 'grind' off your blades, it merely removes small nicks and 'hones' your existing edges to ultimate sharpness (and often better than any grinding wheel).