Burnewiin knives are handsome, traditional looking knives designed for boating and fishing. Each knife locks into a custom sheath and each sheath locks into both the GM400 and GM600 mounts. Just put the sheath?knife combination into the mount closest to the area you need a knife. The blades are made of the highest grade Japanese 420 J2 stainless steel for years of uncompromised use. The KN5610 5? Ocean Knife is the most functional for general use. The KN5650 7? Ocean Knife is just a larger version of the 5? for those who like a bit more steel. The KN5690 7? Bait Knife has serrations on almost the entire blade for sawing frozen bait or any tough job. The KN3610 7? fillet knife is a great fillet knife that may become your favorite accessory. Put a high quality Burnewiin knife right where you need it, when you need it.