SK-8

The biggest difference of the SK-8 from usual safety knives is that the blade automatically retracts after cutting or when it loses contact with the material being cut even if the blade slider is engaged. Accommodates both right- and left-handed users. Durable Aluminium Die-Casting Head. ComfortGrip. No tools requird for blade replacement.

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https://www.olfa.co.jp/en/products/529.html