Metal Perforation Patterns
Pattern Perfection From Hendrick
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.188" Round on .500" Centers Straight11%Open Area
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.188" Round on 1.000" Centers Straight3%Open Area
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.188" x .531" Ellipse on .625" Centers59%Open Area
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.188" X .750" on .375" Slot37%Open Area
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.200" Square on .250" Centers Straight64%Open Area
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.200" Square on .500" Centers Straight16%Open Area
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.219" Diameter Round on .313" Centers44%Open Area
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.219" Diameter Round on .541" Centers15%Open Area
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.250" Diameter Round on .313" Centers58%Open Area
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.250" Diameter Round on .375" Centers40%Open Area
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.250" Diameter Round on .438" Centers30%Open Area
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.250" Diameter Round on .500" Centers23%Open Area