Waste of money. Unlike the 1-inch, it doesn't have a center groove so it can flex just enough to alternate. I spent my money on it (I wasn't sure if it was needed so I worked with it for an hour trying to use it so I couldn't return it). It's called the same as the 1-inch product, but it's not. There are no pictures here to show you, but if you look at 1 inch you can see what it looks like. This product has a fairly flat surface.