... HRAPerformance & application recommendedYM614.9215090.0Good wear resistance, used for hard wood, used for processing original wood, aluminum section bar, brass ... iron.YM6A14.9186092.0Has wear resistance higher than YG6, used for processing hard wood, original wood, aluminum section bar ... cast iron.YM814.7232089.5Wear and percussion resistance , used for processing hard wood, soft wood, ferrous and non ...