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The SM1A11 thread-to-thread adapter contains an internal SM1 (1.035"-40) thread and an external M25 x 0.75 thread. Made of anodized aluminum, it is machined with the two threads connected by a flange and can be placed at the end of a threaded tube. It is typically used to create an objective from an SM1 lens tube. The unpackaged weight of this adapter is 3.18 g.