This 46mm, strike-free wrench features a precision broached 12 point box end ensuring a tight and secure fit. It's specially heat treated and forged using premium tool steel delivering the durability and reliability needed when working with large fasteners. The ability to add the extension bad bar dramatically increases the leverage and torque that can be applied. The design is ideal when power tools are not a practical solution. All Gray Tools strike free leverage wrenches meet ANSI standards and are backed by a limited lifetime warranty.