The 3551 series is an upgraded version of the 3550. Benchmade improved the internals of the knife and added a larger push button for easier deployment. The 3551 still has all of the original features of the 3550 as well: Anodized aluminum handle, 154CM spear point blade, safety on the spine and a very comfortable grip as well.
Choose from either a plain edge blade in black or satin. A partial serrated black blade is available as well.
Please check your local laws regarding automatic knives.