Your Big Grip Ruler Handle will make using rulers at least 4" wide and 12-1/2" long so much more comfortable as you hold the ruler in position. When working with a larger ruler, the handle does the gripping so you can ease up on the pressure to hold the ruler in place. This is especially helpful if you have carpal tunnel or arthritis! The suction cup's lock and release levers hold the ruler securely. For smaller rulers, choose NNRH Hold Me Tight! Ruler Gripper.