Set of ball-end hex wrenches

Never use an extension or other form of lever to increase the leverage of any wrench.

Never tilt a hex wrench. The nut must be fully seated.

Never use a hammer on hex wrenches.

Never expose any wrench to excessive heat, which may change the hardness and metal structure and ruin the tool.

Wrenches should not be ground to change their shape.

Select a wrench whose opening fits exactly.