Pair these holders with a threading insert or a grooving insert to make cuts on the outside of a workpiece. A highly rigid clamping design results in a smoother finish and superior tool life. They are compatible with top-notch style threading and grooving systems. Choose a shank size that fits your machine and workpiece setup. Larger shanks are more stable, while smaller shanks fit into tighter spaces and allow for finer cuts.

Use a right-hand external holder with a right-hand insert when the workpiece rotates counterclockwise (toward the lathe operator). Use a left-hand external holder with a left-hand insert when the workpiece rotates clockwise (away from the lathe operator).

Use clamps with a coolant hole (sold separately) to keep workpieces cool while threading or grooving. The coolant also flushes out chips to prevent clogging and extend tool life.