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If you are building in seaside environment, you need to use 316 grade stainless steel fasteners to achieve adequate corrosion resistance. These screws not only meet that requirement, but they feature the easy-to-use Star or 6 Lobe recess design to virtually eliminate cam-out. The difference between Star drive and Square Drive is largely a matter of personal preference – both offer superior performance. Head Diameter .230". Made in Taiwan.