: : : Greenleaf Corporation : : : Greenleaf Corporation is a manufacturer of ceramic and carbide inserts and custom cutting tools. Greenleaf Corporation is a leading developer of cutting tool technology, specializing in the manufacturing of high-performance tungsten carbide and ceramic inserts as well as innovative tool-holding systems. Greenleaf continues to build on 60 years of innovation, which centers on supplying customers with productive solutions to every metalcutting situation.