9 Inch Black Swinguard Switchblade Stiletto Automatic Knife Bayo. This swinguard has a 3.5 inch blade 440 stainless steel with a safety switch and a free belt sheath. Total length of the auto knife is 9 inches. With the push of the button the blade pops out the side very smoothly and locks into position. To release the blade you push the back lever on the back on the handle.