Kershaw-1640-VAPOR Folding Pocket Knife (4" AUS-6A Stainless steel Blade) The Kershaw Vapor combines the uncompromising quality of a Kershaw with a sleek Ken Onion design to deliver an excellent everyday folding knife. The blade is AUS6A stainless-steel with a 55-57 hardness rating. A thumbstud provides easy and smooth manual closure, and a frame lock secures it into the strudy 410 stainless-steel handle. The industrial-tech look of the hard steel handle with the drilled design is not only good looking, it lightens this knife to an airy 3.25 oz. With a 4 inch folded length, this knife is the perfect inexpensive, yet durable pocket knife.