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These 410 stainless steel screws are more corrosion resistant than ultra-corrosion-resistant coated steelscrews. They'realso known asTapcons. All have a hex head for a secure grip with awrench. Drive into a hole with a hammer drill or socketwrench, or use a specialized tool set(soldseparately). Pull-out strength and shear strength values are25%of the ultimatevalues.