The basics of parallel-jaw pliers.
Regular pliers' jaws come together at an angle, and sometimes that isn't what you need -- these pliers' jaws come together parallel, providing flat contact on opposing faces of fasteners. Less risk of damage, less risk of slippage!
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Speedrite Parallel-jaw fencing pliers (similar to show): amzn.to/36oAigY
Parallel pliers (without side-cutter): amzn.to/2Uem1hi
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Knipex Pliers Wrench (same, just with normal handles): amzn.to/3pfm5vb