Trigon (W) turning inserts have a modified triangular shape that has three cutting points with 80° nose angles. Also called trigonal inserts, they have a stronger cutting edge than triangle inserts but make shallower cuts. They are used for turning and facing tasks in roughing and finishing applications. These indexable inserts mount to a compatible toolholder, which attaches to a lathe or CNC turning machine. They can be rotated (indexed) to expose a fresh cutting edge when the old one dulls. They can be replaced with new compatible inserts of the same style or a different style without removing the toolholder from the machine. Indexable turning tools require fewer tool changes than solid tools in high-volume metalworking and fabrication applications with high speeds, high feeds, and difficult-to-machine materials.