What shape is a cotter pin puller?

• A. U-shaped
• B. L-shaped
• C. T-shaped
• D. S-shaped

Answer: (D)

The key idea is how tool shape enables grabbing and removing a small fastener. A cotter pin puller is designed with a curved, hooked tip that can slip behind the cotter pin and pull it out with control. The S-shaped form provides that hooked reach in a compact profile, allowing you to engage the pin from the side or through a narrow space and apply a steady pull without bending or breaking the pin.

This shape is effective because it combines reach and grip in a single ergonomic form. Other shapes wouldn’t offer the same hook capability or maneuverability: a U-shape tends to cradle rather than hook and can slip off; an L-shape can be awkward to maneuver and loses the hooking advantage; a T-shape lacks a proper hooking point and doesn’t align well for pulling the pin straight out.