Cle-Line quick set two piece die system: 1/2-20 #5 0550 quick set die. Two-piece construction with two cutting edges in each piece. One side has a 2 to 3 thread chamfer for threading; the other side has a 1 to 1-1/2 thread chamfer for threading close to a shoulder. Unified and American National thread form standard. Enables a wide range of adjustment.