The Pentagon OTF SOG 15-61-01-57 is an American-made blade crafted with meticulous attention to satisfy the stringent expectations of users who need a reliable, swift-opening knife that can be comfortably operated with one hand. This knife incorporates SOG\'s innovative Dynamic Lock-up System which offers superior open reliability and strength for blade lock-up in OTF knives. This, coupled with the Cryo S35VN blade, provides unmatched resistance and toughness, solidifying the knife\'s overall durability. The hard-anodized aluminum handle of the Pentagon OTF further strengthens the knife\'s longevity. This knife is ideal for professional use, offering reliable OTF technology that caters to those who place value on high-end steel and advanced technology. The part number for this product is 15-61-01-57.