\r\n\r\nNeedless to say, lopping off a finger while tearing into a package is never a good thing. \u00a0The result is usually a drive to the ER and an ice bath for the severed digit. \u00a0Okay, so that predicament is a bit rare, but for anyone tearing into boxes on the regular, you'll definitely wanna have a close look at the Wiss Utility Box knife that automatically retracts its blade when the cut is complete. But if you're looking for a knife that can inflict serious, permanent and perhaps deadly damage, take a look at the Jagdkommando integral tri-dagger fixed blade knife.\r\n[GR]f7DDz3D8SiY[\/GR]\r\nIt doesn't use any special sensors or robotic mechanics. \u00a0Inside is a special mechanism comprised largely of a spring. \u00a0When it senses that the blade no longer has pressure against it, it automatically retracts back inside of the handle. \u00a0Think of it as the opposite of a switch blade. \u00a0Other than that, the Wiss works like any other utility knife and seems to use standard utility blades.\r\n\r\nSo how much would you expect to pay for this? \u00a0Believe it or not, it sells for just $20, which is probably on par with other box cutters.