TheKen-Tool Multi-Purpose Vise features two sets of jaws for fast clamping on workpieces. The 5" wide jaws are made of No. 45 carbon steel, heat treated with precision machined jaw teeth. They provide a solid grip on pipe or square stock. Its main screw system is a U-shaped collar designed for a stronger clamping force and durability. The head of this vise rotates 360 degrees, along with a 360 degree swivel base. Gear-type locking system with double lock-down bolts locks vise securely in position.