Industrial thin stock non-ferrous metals blades were designed specifically to cut thin, non-ferrous metal extrusions, such as aluminum storm window frames, without damaging the delicate profiles. The high number of specially formulated micrograin carbide tips and the slightly positive hook angle allow these blades to slice quickly and cleanly through the material without binding. Freud recommends ample 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!