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A 20mm outer diameter barrel with male threads at base end has secondary finely threaded interior barrel to allow fine focusing. Secondary barrel has female threads, knurled ring at front end, and threaded interior for light baffle. Set screw fixes position in place. Featuring length ranges from 13.5mm to 25mm.
Copyright year, Edmund Optics Inc.
18 Woodlands Loop #04-00, Singapore 738100