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SKH4C: (a kind of high speed steel, which does not rust at all. )
This is super high hardness super mirror finish stainless high speed steel. It is characterized by excellent anti-rust, anti-corrosion, anti-worn (high hardness) and ideal impact resistance properties. It applies to a wide range. Its useful life is 3-6 times than normal stainless products.
Moreover, AIS1440C and SUS440C are even better quality of incisiveness and much more excellent anti-worn properties. Under salt water circumstances, it`s anti-rust capability could improve more than 10-20 times. Its quality is quite good and stable. Hardening treatment: HRC58"2"
Drill Bit