A trapezoidal-flat tooth (TR-F) saw with a negative rake angle is a saw for aluminum. It will also work well as a saw blade for cutting plastics and abrasive materials such as gypsum board or mineral wool. It will find use primarily as a saw for optimizers, circular saws and miters. The cutting quality of the NF-negative blade is coarse or good depending on the diameter and number of teeth. In brief. Machine/Application: Bevelers/cutters/optimizers For cutting and angle cuts in aluminum and plastic profiles Design: Uniform rake angle Serration: trapezoidal-flat teeth "TR-F" Quality 3-0-1 from Ø 301 upwards Blade material: HW TCm 10, from Ø 301 onward TC06 Advantages: Noise reduction due to soundproofing laser cuts QUALITY OF CONSTRUCTION. Saws made to the 2-0-6 quality standard characteristic of saws for professional applications or the highest standard offered by Stehle, 3-0-1, which is used in intensive industrial production. QUALITY OF CUTTING MATERIAL.