Which tool is designed to turn nuts and bolts with adjustable openings?

• A. Crescent wrench
• B. Hammer
• C. Pliers
• D. Screwdriver

Answer: (A)

Turning nuts and bolts of different sizes requires a tool with a movable jaw that can fit various fastener openings. The Crescent wrench is designed exactly for this: an adjustable wrench with a screw-driven jaw that you can open or close to grasp different nut and bolt sizes. With the jaw set snugly, you get good grip and leverage to apply torque and turn the fastener without rounding its corners. The hammer can only strike and isn’t meant to grip or turn anything. Pliers can grip but aren’t ideal for turning nuts and bolts reliably and can slip or squeeze too tightly. A screwdriver is meant for screws, not hex or square nuts. So the adjustable jaw of the Crescent wrench makes it the best tool for turning nuts and bolts of varying sizes.