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Industrial thick non-ferrous metals blades are for cutting non-ferrous metal such as copper pipe, aluminum extrusions, brass plate, etc. These blades have custom designed gullets to minimize chip build-up. Freud recommends the use of a 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. Note: Wax sticks are not recommended!