1. Hardness: 6 1HRC is higher and harder than 58HRC. Generally speaking, the higher the hardness of the tool, the stronger the cutting performance and the higher the durability.

2. Toughness: The toughness of 58HRC is better than that of 6 1HRC, that is to say, the tool of 58HRC is not easy to collapse during cutting, and it is more suitable for cutting tasks that require certain toughness.

3. Sharpness and retention: Generally speaking, a tool with higher hardness, such as 6 1HRC, will be sharper than a tool with lower hardness, such as 58HRC. But at the same time, because of the high hardness, the holding power of the tool will be relatively low, that is to say, the holding power of the blade is slightly poor, and it may need a higher grinding frequency to maintain its cutting performance.

Generally speaking, tools with different hardness can be selected according to different needs and usage scenarios. It should be noted that the above conclusion is only a general description, and the specific situation may be different due to factors such as specific tool material and processing technology.