I have a safety shield that is glued 1/4 inch from the edge. It is made by O'lipfa. Not all quilt stores carry them but I did see some online once I typed in O'lipfa Safety Shield and several stores came up. I have it on my 24" ruler where I usually have the most problems because I am vertically challenged (short). It has saved my fingers several times...so I really like it. At the store where I was a manager It was mandatory to use the ruler with the guard.