Reduces manual errors: The rolling design makes the foil application smoother, speeds up the glass foil process, improves work efficiency, and yields a smooth edge on the copper foil. Precise foiling aid: The guiding groove design keeps the copper foil centered on the glass, prevents wrinkling and curling, and works easily with a copper foil dispenser. Flexible use: Compatible with a range of glass sizes. Handles 7/32 and 3/16 inch copper foil tape, making it suitable for stained glass projects of any size. Professional must have: An essential tool for seamless copper foiling across different sizes, suitable for both beginners and experienced craftsmen. Practical applications: Perfect for new stained glass panels, repairing or re-foiling edges of existing pieces, and creating projects such as suncatchers or panels of varying scales.