This inexpensive tool is the best hand tool we have found for sharpening carbide tips. To roller ski on asphalt it is very important to have sharp carbide tips. It’s a good idea to quickly sharpen your tips before each outing as sharp tips make for a more pleasant experience and dull, worn down tips are harder to sharpen. We now offer three versions. The original green handled extra coarse grit file has a sharpening pad 3/4" x 2". The wide black handled file has a slight angle to the file head with a coarse pad 3/4" x 1.5" that many find a bit more coarse. The narrow black handled file has a pad 1/4" x 2 3/8" that is great for fine tuning, as the narrower pad makes it easy to see where you are working.