About SELECTOOL The SELECTOOL has been delighting users since 1963, when the first units came out in Aluminum. The SELECTOOL is the easiest way to get a razor-sharp edge on any knife or tool in seconds, and it works every time. It is American-Made and comes with a Lifetime Warranty. It weighs less than 3 ounces, and is the perfect tool to sharpen any knife or tool on the go. Learn to work it properly on my Training Page and you'll have zero issues. Contact Us if you need any help. We're happy to assist. Happy Sharpening!