??????Assisted Opening Blue Spider. Spring assisted folding knife for folks who need one hand opening but  can't qualify for an automatic knife. Start the opening process and the spring will push the knife out the rest of the way.They are commonly confused with switchblades, but have one main difference. While a switchblade can be opened usually with the push of a button, the user of an assisted knife must apply some pressure to the knife, usually at the thumb stud, thumbdisc or index finger protrusion. Once the knife has been opened about one-quarter of the way(45°), the mechanism will open the knife the rest of the way. These are NOT switchblades. You open the knife slightly with the thumb stud and then the spring takes over, snapping the blade open like a switchblade.