Grader blade 5D9556 for Caterpillar part Material:High carbon steel Hardness:HB280~320 ... and Scraper.A) Part No.: Grader blade 5D9556 for Caterpillar part B) Material: High carbon SteelC) Hardness:HB280~320D ... ) For brands: Caterpillar, Komatsu, ESCO, Fiat, Hyundai, Case, Sany etc.E) OEM ... and other products. Grader blade 5D9556 for Caterpillar part