The Rounding Jack Brim Cutter is an essential tool for professional milliners, designed for precise and efficient cuts on felt hat brims up to 20 cm (8") in length. It features a replaceable blade for quick and accurate trimming, while its sturdy metal base protects your work surface. Before using the cutter, block the felt and shape it with water or steam, allowing it to dry completely before cutting. This hat-making tool comes with a set of five replaceable blades for extended use.