meat chopper knife , unger systerm hardness is higher and more long time wear meat chopper knife , unger systerm hardness is higher and more long time wearmaterial is 420, 9crsi, cr12movand long time wear and wearsuitable for big electric meat grinderprecision processingsize: H82, A90, B98 C106 D114,E130 G160 U200 AND 250