... make groove V or groove U (optional) onto cardboard, MDF board, etc 2. Perfect finished product 3. Easy operation This automatic ... groove U (optional) onto kinds of materials, like cardboard, MDF board, etc.Features:1. Easy for operation, high efficient.2. Wide ... application, it works for cardboard, MDF board, etc.3. With adjsutable cutting angle (80-140 degree).4. Perfect finished ...