Gender changer. Allows you to convert a male 2" filter thread into a female 2" filter thread. Basically, it is a ring with a smooth outside and a 2" filter thread (note that a 2" filter thread specification is M48x0.75 and not actually 2") on the inside all the way through. Made of black anodized aluminum. Outside diameter = 50.8mm (2") so this will slide into 2" focusers. Total length is 6mm (0.24").Blue Fireball part number: G-2F
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