Tool post and tool post holder sets include a tool post and multiple tool post holders, which are compatible with different styles of tools. They are used on a manual or CNC lathe for applications ranging from fine work to heavy-duty cutting. They maximize tool rigidity and minimize backlash to make accurate cuts with precise repeatability. Tool posts attach to the lathe\'s carriage to provide a base for securing and positioning tool post holders. Tool post holders mount closely to the lathe\'s tool post and hold cutting tools at a specific angle for machining workpieces. These tool post and tool post holder sets are used as part of a quick-change system that speeds tool changes when making different types of cuts on the same machine.