Used on concave, convex 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
Backs of all half-round smooth files are single-cut
Flat sides of all half-round files are double-cut
Pipeliner file model QN384 is single-cut on back and flat sides