Used on concave, cinvex and flat surfaces. Rounded on 1 side, flat on opposite. Backs of all half-round bastard files are double-cut. Backs of all half-round second-cut files longer than 6" are double-cut. Backs of all 4 and 6" files are single-cut....
Used on concave, cinvex and flat surfaces. Rounded on 1 side, flat on opposite. Backs of all half-round bastard files are double-cut. Backs of all half-round second-cut files longer than 6" are double-cut. Backs of all 4 and 6" files are single-cut....