Switchblade Lever Smoke Stack Automatic Knife. This handmade switchblade is constructed with a D2 steel blade that has a satin finish. This type of metal is an air hardening, high-carbon, high-chromium tool steel. It offers hardness in the range 55-62 HRC. This blade features a serrated edge for cutting rope or twine. The thick handle is made from stained bone that has been nailed into the frame with brass pins. A genuine brass frame adds a bit of a contrast with the white copper lever and bolster. The chiseled spine finished off the back of the knife with flair. This custom piece has a flawless automatic function which has to be the best feature. Overall Length: 9 Inches.