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Male to female lock ring: male thread outside, and female thread inside, thickness is 3.5-4.5mm:
86mm-82mm male to female lock ring
82mm-77mm male to female lock ring
77mm-72mm male to female lock ring
Standard 67mm step up ring, $15 each
Available sizes: 49-67mm, 52-67mm, 55-67mm, 58-67mm.
Standard 77mm step up ring, $15 each
Available sizes: 49-77mm, 52-77mm, 55-77mm, 58-77mm, 62-77mm, 67-77mm, 77-82mm, 77-86mm.
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