The Original Gypsy Gripper is designed with two suction cups that attach to any smooth ruler surface. The Gripper ensures that even pressure is applied to the cutting surface so you can relax and rest your hand comfortably over the handle. Since no death grip is required, this tool is recommended for anyone with hand issues such as arthritis and carpal tunnel. Your hand is always away from the rotary cutter so your fingers are out of harm’s way, making this a must-have for any new or young quilter! Note: The ruler must be at least 4in wide and 12.5in long - excluding the hang hole - to be effective.