NAVIGATION
Sapphire sphere; diameter(mm), 2.00; grade 25
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Sapphire sphere; diameter(mm), 1.75; grade 25
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Sapphire sphere; diameter(mm), 1.50; grade 25
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Sapphire sphere; diameter(mm), 1.00; grade 25
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Sapphire sphere; diameter(mm), 0.50; grade 25
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Sapphire sphere; diameter(in), 1/32" (0.794mm), grade 25
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