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Thread size is 48mm (.75 pitch) for use with WIDE T-Ring or T Adapter. Outside Diameter is 2” (slips into a 2” Eyepiece Port). These handy extension sets can be used to securely place your camera where you want it. Threaded Male on one end, Female on the other. Includes 4 pieces (20mm, 15mm, 10mm and 5mm).