Gender changer. Allows you to convert a female 1.25" filter thread into a male 1.25" filter thread (thread specification M28.5x0.6). Has a knurled grip in the center with a very short optical length of 1mm, and male 1.25" filter threads on either side. Made of black anodized aluminum. Maximum outside diameter = 31.7mm (1.25") so this will slide into 1.25" focusers. Total length is 6mm (0.24").Blue Fireball part number: G-1M
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