Tool post holders hold cutting tools at a specific angle for machining workpieces on a manual or CNC lathe in applications ranging from fine work to heavy-duty cutting. They mount closely to the lathe\'s tool post to maximize tool rigidity and minimize backlash for making accurate cuts with precise repeatability. These tool post holders are used as part of a quick-change system that speeds tool changes and tooling setups. They are compatible with specific tool posts and cutting tools.