Keep it in your toolbox. You will reach for it weekly.

While the core principles of metalworking don’t change—steel still has a specific gravity of 7.85, and threads still need to fit—the industry does. The 4th edition bridges the gap between traditional craftsmanship and modern CNC (Computer Numerical Control) technology.

With the release of the , many might wonder: In an age of smartphones and cloud computing, do we still need a physical handbook?