Flex-Hone tools create a cross-hatch finish on the ID of the valve guide bore for better oil retention and less wear on both the valve guide and the valve stem. Recommended RPM: 800 - 1200 Remember, Flex-Hone tools are designed to be used with Honing Oil or and oil based lubricant. Never use solvents with your Flex-Hone as it will degrade the adhesive bonds in the tool.
