This video investigates the ballistic resistance of hard hats, a common piece of personal protective equipment in construction. The title directly poses the question of how many hard hats are needed to stop a bullet, implying a test or demonstration of their effectiveness against firearms projectiles. The description reinforces the focus on hard hats and safety helmets within a construction context. While the specific firearm or caliber used is not mentioned, the core concept revolves around projectile impact and penetration.
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