Request InfoCockrill Precision ProductsCockrill Precision Products offers mounting rings for finishing and protecting the edges of lenses, filters, gratings, pellicles and mirrors. The aluminum mounting rings are machined to ±0.05 mm and are black anodized to provide a nonreflective surface. They have an internal recess that holds the optics and are available in single- and double-sided and two-piece configurations that fit within each other. 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