Indexable boring bars are single-point cutting tools that use replaceable inserts to size, straighten, and finish the inside of drilled or cast holes. They mount to a lathe or turning machine and remain stationary while the machine rotates the workpiece against the boring bar's cutting tip. The inserts are seated at the cutting tip and can be swapped out for new ones of the same style or a different style compatible with the boring bar without removing the boring bar from the machine. Each insert will have multiple cutting edges, so it can be rotated (indexed) to expose a fresh cutting edge when the old one dulls. Indexable boring bars require fewer tool changes than solid tools in high-volume metalworking and fabrication applications with high speeds, high feeds, and difficult-to-machine materials.