Knife bastard file at 6 inches, 152 mm. Knife-edge profile gets into narrow slots and acute angles for stock removal in fabrication and machine shop work.
Mill bastard file at 6 inches, 152 mm. Single-cut tooth pattern used for sharpening lawn mower blades, saws, and draw filing in fabrication and shop work.
10 inch knife bastard file at 254 mm. Tapered knife edge for stock removal in narrow slots and acute-angle joints in fabrication and industrial maintenance work.