4pcs Graphite Tube, Hollow Graphite Rod, Widely Used In Sintering Mold, Inner Diameter Can Be Customized, Length 500mm,OD10mmID2mm : Amazon.co.uk: Business, Industry & Science
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Amazon.co.jp: As One 3-8532-01 Graphite Tube, Diameter 0.8 x Diameter 0.6 x 3.9 inches (20 x 15 x 100 mm) : Industrial & Scientific