The Coast DX315 features a patented Double-Lock safety switch mechanism which works in conjunction with the primary Liner-Lock to prevent disengagement when the knife is open, even if the Liner Lock is inadvertently dis-engaged. An aluminum handle adds incredible strength and durability. Thumb studs on both sides of the blade make opening the blade easy; right or left handed. Backed by Coast's lifetime guarantee against defects in materials and workmanship.