Denim Pants Size Adjustment Never used. Stored at home, so please consider if you don't mind. This is used to tighten the waist of denim pants when they are loose, by attaching it at your desired position. You insert the needle and secure it on the back. Pulling the gap on the back will remove it. Waist adjustment button, button, denim, pants, jeans, no tools required Available for immediate purchase. Please comment if you have any questions.