... HB380~450 We specialized in manufacturing various grader blade for all brands of Motor grader, Bulldozers,Excavator,Loader and Scraper.A) ... or boron steelC) Hardness: HB260~320 or HB380~450 D) For brands: Komatsu, ESCO, Fiat, Hyundai, Case, Sany etc.E) ... which is for reference purpose only.Welcome to order our grader blade and other products. Construction equipment machine part motor grader blade ...