New Crain No. 341 Selvage Trimmer Replacement Blade for the Crain No. 340, Carder 128 and Armstrong S-33 Edge Trimmers. Includes one replacement blade for the No. 340 Selvage Trimmer. Trims the factory selvage so the sheet can be accurately scribed and seamed. The U-shaped blade ensures a smooth, accurate, square-edged cut that will be perpendicular to the floor to match an adjacent edge.