Professional burl cutters, fire departments and pulp mills have relied on Rapco carbide chain for years. Rapco chamfered carbide chain is made by grinding a portion of standard saw chain away and silver soldering a solid chip of carbide back on. The carbide chip is then reshaped to match the original design. The result is a saw chain that can last exceptionally long in abrasive conditions. Rapco chamfered carbide chain is recommended for cutting creosote treated poles, paper rolls, railroad ties, demolition work, frozen logs and sawing in sand impregnated bark. Cutting speed is significantly reduced when using this chain. Use a diamond grinding stone or wheel to sharpen. Please note that there is no warranty on this chain, and this type of carbide will break and chip if impacted by hard objects.