S.R. Transformer Military Tactical Mechanical Folding Knife Best Buy, Best Choice for Survival, Walking, Sailing, Craft, Gardening or Camping Gear Patent product with unique structure and innovative design , put away the traditional construct. Blade: 440 Hign Carbon Steel  With belt clip Overall Length: 16.0CM  Blade Length: 6.4 CM Condition: Brand New in Original Box This knife is very wonderful, different from others. how to open and how to close? It will give you an answer when you get it. I think you must be very interested in this knife.