For fine cutting work. EG: in electronics and fine mechanics. Sturdy zero backlash box joint. Low friction because of the double spring for gentle and even opening. The polish or mirror polish (only finish 2) together with a fine film of oil, offers effective rust protection- no circuit faults caused by peeling chrome from plated tools. Cutting edge hardness 62 HRC. High Grade special tool steel: forged and oil hardened.