This is a 69 mm male to 48 mm male adapter that adds 3 mm of length. The 69 male thread is 5.5 mm long and the 48 mm male thread is 5 mm long.
In order to use a 2" filter you need to get the following adapter:
63 mm Male to 48 mm Female Adapter and 2" Filter Holder - SFA-M63F48
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This is the part you need if you have a 10 inch truss-tube RC telescope and want a threaded connection from the focuser drawtube to your M48 imaging train (instead of the stock compression fitting).
Worked great to connect my field flattened to my new Zwo camera.
Very well made. I am taking off a star (I would prefer to take off only half a star) because the interior of the adapter is not painted flat black. I will be doing this myself.
Title says it all. Adapted my camera to the SQQ-86