One Black metal ring, also known as conversion adapter tube 

It is for photo cameras like Canon, Nikon, etc. 

This has 56 mm diameter at the bottom and 58 mm diameter on the top. The tread diameter (the way I measured it using a ruler) is 58". 

As you can see from photo number 8, it connects via its thread to the adapter ring for the Bower 58 mm Canon. Please note that photos 8 and 9 are only for illustration of how this item can be used; you will not receive the whole assembly. You will receive only the adapter ring shown in the first photo.

Free shipping! 

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Will be shipped from Virginia.