This is a 2.156-24 male thread to 48 mm female adapter that adds 3 mm of length. The 2.156-24 male thread is 5 mm long and the 48 mm female thread is 8 mm deep.
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Good fit and finish, exactly as expected. Only improvement I can suggest is two small holes in the flange for a snap-ring spanner wrench, to help remove it when it gets stuck in the camera.
good fit - smooth threading action - timely shipping
Excellent product, fair price, made to Stellarvue's exacting standards.