Multitool Multifunctional Stainless Steel Tool

Because the moment you need force is the moment an unlocked tool folds. A screwdriver that collapses while you lean on it puts the handle edges into your palm, and a knife blade doing the same is worse. Locking tools let you use the thing properly rather than tentatively.

For field repairs, yes. For sustained work, no: the handles are short, so torque is limited and your hand tires. It is the tool that is with you.

That one is plier-led with twelve functions including fishing tools. This one is the general-purpose option with the locking mechanism. If you fish, take the other. If you want something that locks solidly for camp and vehicle work, take this.

Stainless resists it, but the pivots will seize with salt if never rinsed. Rinse in fresh water after the coast and put a drop of oil in the joints.

Keep the pivots clean and oiled, do not force a stiff joint, and learn the release for each lock before you need it in a hurry.