HIGHLY SPECIALISED – FOR MANY APPLICATIONS. With its Cutting depth of up to 36 mm, the SECUNORM 540 is in a field of its own. The MARTOR safety knife demonstrates its impressive strengths especially when Cutting foam, polystyrene, paper rolls and bagged goods. For all its specialism, its robust and ergonomic aluminium handle is easy to hold and suitable for either hand. The proven automatic blade retraction protects you from Cutting injuries.