Which tool is used to remove and tighten bolts and nuts of various sizes?

• A. Adjustable open-end wrench
• B. standard screwdriver
• C. Torque wrench
• D. Locking plier wrench

Answer: (A)

An adjustable wrench is the tool designed for turning bolts and nuts of different sizes. Its jaw width can be changed with a screw mechanism, letting you fit many hex heads with a single tool. This versatility is exactly what you need when removing or tightening fasteners that aren’t all the same size. Other tools aren’t as well suited: a torque wrench is for applying a precise amount of twist, not for general turning; a standard screwdriver works on screws, not bolt heads; and locking pliers can grip but aren’t ideal for consistently turning many sizes and can slip or mar the fastener.