This is a 48 mm extension tube that adds 10 mm of length. The outside diameter is 2.0". The male thread is just under 3 mm long and the female thread is about 6 mm deep.
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206-327-9826
Email: matt@cloudbreakoptics.com
Mon-Fri: 10am to 5pm
2821 NW Market ST, STE G
Seattle, WA 98107