Extrema Ratio RAO Folder Knife - 5-5/8" closed. N690 stainless cobalt steel blade with Testudo finish. Extra safe locking device is a steel pin that is hand screwed into place, locking blade open or closed. Black anodized anticorodal aluminum alloy handles. Lanyard. OD green nylon sheath is MOLLE compatible and holds diamond sharpener. Sheath can accommodate knife in open or closed position.