Wrench and plough: what they have in common

1. Step 1. Wrench — uses — Bolt and nut. A wrench turns nuts.
2. Step 2. Bolt and nut — has part — Screw thread. A bolt and a nut are joined by a thread.
3. Step 3. Screw thread — is used in — Screwdriver. It drives screws.
4. Step 4. Screwdriver — has part — Handle. A handle.
5. Step 5. Handle — is part of — Plough. Handles for steering the plough.

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