Indexable slitting cutters cut slits of varying depths or make other slim cuts in cut-off and shouldering operations. Also called milling cutters, these mills have a thin, disc-shaped body. They mount to a milling machine and hold replaceable, multi-edged cutting inserts that can be rotated (indexed) to expose a fresh cutting edge when the old one dulls. The inserts can be replaced with new ones of the same type or different types without removing the slitting cutter from the machine. Indexable milling 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.