GSI Tactical. Black Echo Folding Knife. 4.7" Closed, 3.5" Blade. HRC 53-55 Steel. Bottle Opener Hunting Knife. Survival Knife. Military Knife. Clothing clip and lanyard hole for easy carrying. Primed for everyday use, this durable cutting knife is a perfect addition to every use. Serrated edges. Black G10 Handle with 420 steel.