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Knurled knobs with coin slot Standard material Polyamide Thread Steel zinc plated moulded Special thread inserts upon request Standard color Black  explore #สล็อตbk7 at Facebook

pg เว็บตรง fish BK7 and N-BK7 are high purity, low cost borosilicates with excellent optical properties, making them a frequent choice for optics, prisms, and windows  BK7 is a standard glass for all kinds of optics The SCHOTT glass is nearly bubble free, has an excellent clarity, and a very low amount of inclusions