Built upon the M61 Vulcan’s reputation of speed, power, and versatility, the SOG Vulcan is also formidable with a powerful strength of construction. There is nothing weak about the Vulcan. For instance, our patented Arc-Lock™ can hold over 1000 lbs. of force. The full steel liners encased in glass reinforced nylon (GRN) handles give the knife rigidity and durability.