Features: Use the LU89M series blades for cutting nonferous metal such as copper pipe, aluminum extrusions, brass plate, etc. These blades have a custom designed gullets to minimize chip build-up and specially forulated micrograin carbide tips and Tri-metal brazing for long life and clean cuts. Freud recommends Ample use of liquid lubricant when cutting. This can be accomplished with a squirt of wd-40 or other lubricant every 4 or 5 cuts or with an elaborate industrial drip system. Wax sticks are not recommended.