This is a must have tool for quilters. The Gypsy Gripper has a comfortable grip handle and two large round suction cups with handy lock and release levers. Just press the suction cup to any plastic or metal ruler that is at least 4″ wide, including most rectangle, square, or triangle shapes, then flip the levers to lock in place. When you want to change rulers, just flip the levers to release. Your ruler hand will be up and out of harm’s way.