OK4 is a powerful, solid outdoor knife with nonslip handle for demanding work. It can be attached to belts up to 80 mm wide with a textile belt loop, while a further loop holds a fire steel. The Scandi grind blade is easy to sharpen; it is made of 3 mm thick carbon steel, hardened to 58-60 HRC and protected from corrosion by an electrophoretic dip coating. The grinded blade spine is suitable for starting a fire with a fire steel.