Nail extension forms used for sculpting acrylic or UV gel nail extensions. Nail Building: Placed under the natural nail edge to act as a temporary guide or shelf when building artificial nails with acrylic, polygel, or builder gel. Length and Shape Control: The printed grid lines and numbers (typically 1 to 7) help ensure equal length, symmetrical shaping, and precise styling on each finger. #uvgel #nailextention #