___ screws have a square or hex head and are designed to be turned with a wrench.

___ screws have a square or hex head and are designed to be turned with a wrench.

• A. Rivet
• B. Nail
• C. Lag
• D. Bolt

Answer: (C)

The key idea is identifying fasteners by how they’re driven and what head they have. A square or hex head that’s turned with a wrench points to lag screws. These are heavy-duty wood screws with coarse threads designed to bite into wood, often used for strong joints in timber. They’re driven in with a wrench (or socket) and don’t rely on a nut like bolts do, which helps differentiate them from bolts. Rivets are set by deformation and aren’t turned with a wrench, and nails are hammered in, not twisted with a tool. So the fastener that fits this description is the lag screw.

The key idea is identifying fasteners by how they’re driven and what head they have. A square or hex head that’s turned with a wrench points to lag screws. These are heavy-duty wood screws with coarse threads designed to bite into wood, often used for strong joints in timber. They’re driven in with a wrench (or socket) and don’t rely on a nut like bolts do, which helps differentiate them from bolts. Rivets are set by deformation and aren’t turned with a wrench, and nails are hammered in, not twisted with a tool. So the fastener that fits this description is the lag screw.