ROUND FILES Ideal for sharpening round openings or concave surfaces. Includes large comfort grip handle. Precision-machined cutting edges. Hardened and tempered construction for maximum durability. HALF ROUND FILES Ideal for concave, convex or flat surfaces. Includes large comfort grip handle. Precision-machined cutting edges. Hardened and tempered construction for maximum durability. MILL FILES Ideal for sharpening mill or circular saws. Includes large comfort grip handle. Precision-machined cutting edges. Hardened and tempered construction for maximum durability. Triangular Files: Ideal for Shaping, Sharpening and Deburr Hobby Models, like Jewelry, Clocks, Watches and Soft Metal etc.