The American made Pentagon OTF automatic knife is designed to meet the exacting demands of users who require a dependable one-handed, fast opening switchblade knife. SOG's Dynamic Lock-up System redefines open reliability and blade lock-up strength in OTF knives, while the CRYO S35VN blade and hard-anodized aluminum handle reinforce the durability of the knife. Pentagon OTF delivers reliable OTF technology for professional users who rely on high-end steel and technology. Part# 15-61-01-57. OVERALL LENGTH 9.08" CLOSED LENGTH 4.06" BLADE LENGTH 3.79" BLADE THICKNESS 0.11" WEIGHT 6.7 oz BLADE STEEL TYPE CRYO CPM S35VN BLADE FINISH Black Titanium Nitride BLADE SHAPE Spear Point EDGE TYPE Straight HANDLE MATERIAL Aluminum HANDLE COLOR Blackout OPENING MECHANISM OTF Switch LOCKING MECHANISM Dynamic Locking System COUNTRY OF ORIGIN USA