the one I bought at the fabric store is called "The Gypsy Gripper". Costs about $20, but worth every penny. Will admit that I'm a sucker for gadgets, but this tool works really well for keeping your ruler secure on the fabric. An added plus is that he tool is also great from an ergonomic perspective. My girlfriend has severe Rheumatoid Arthritis and this tool makes cutting much easier on her hand and wrist.