NAVIGATION
Sapphire sphere; diameter(mm), 4.78 (3/16in); grade 25
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Sapphire sphere; diameter(mm), 5.00; grade 25
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Sapphire sphere; diameter(mm), 4.00; grade 25
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Sapphire sphere; diameter(mm), 3.00; grade 25
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Sapphire sphere; diameter(mm), 2.50; grade 25
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Sapphire sphere; diameter(mm), 2.00; grade 25
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