Zinc selenide focusing lens 12 18 19 20 laser lens lens engraving machine cutting machine accessories

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Color classification:: Diameter 12 focal length 50.8 mm diameter 18 focal length 25.4 mm diameter 18 focal length 38.1 mm diameter 18 focal length 50.8 mm diameter 18 focal length 63.5 mm diameter 18 focal length 76.2 mm diameter 18 focal length 101.6 mm diameter 19 focal length 25.4 mm diameter 19 focal length 38.1 mm diameter 19 focal length 50.8 mm diameter 19 focal length 63.5 mm diameter 19 focal length 76.2 mm diameter 19 focal length 101.6 mm diameter 20 focal length 20 focal length 20 focal length 20 focal length 38.1 mm diameter 20 focal length 20 focal length 63 .5 mm diameter 20 focal length 76.2 mm diameter 20 focal length 101.6 mm diameter 20 focal length 127 mm other specifications contact customer service focal length measurement bulk purchase contact customer service