proof Steels. There isn't iron and sulfur of halide in it. Its products own long lifetime. It has wide usage. Materials that we use to make abrasive products: Black silicon carbide (C) Major series of products: T41 flat cut off discs Meaning of 'T41 C46 R8BF 80m/s': 1) T41: T41 flat cut off discs 2) C60: Aluminum oxide materials grit C46 3) R: Harness grade 4) 8: Structure no. 5) B: Combined material 'resin' 6) F: Fiber glass reinforced 7) 80m/s: Means meter per second, rotary speed 9" 230X3X22 7" 180X3X22 6" 150X3X22 5" 125X3X22 4.5" 115X3X22 4" 100X3X16 7" 180X3X22