Gypsy Quilter The Original Gypsy Gripper
Gypsy Quilter Gripper has a comfortable handle and 2 large suction cups with hand lock and release levers.  Simply press the suction cups to any plastic ruler, then flip the levers to lock in place.  Will work with smooth surface rulers that are at least 4 inches wide, including most rectangles, squares, and triangle shapes.  Measures:  11-3/8 by 3-1/2 inches.