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Amazon.com: LAB4US Agate Mortar and Pestles Set ID 80mm Natural Agate Grinder for Lab Grinding Polished Brazilian Agate Internal Diameter 80mm, External Diameter 100mm; Depth 24mm; Hardness 7-7.2(80mm) : Industrial & Scientific
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Amazon.com: LAB4US Agate Mortar and Pestle Set ID 65mm Natural Agate Grinder for Lab Grinding Polished Brazilian Agate Internal Diameter 65mm, External Diameter 80mm; Depth 16mm; Hardness 7-7.2(65mm) : Industrial & Scientific
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