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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This item suffers from the same problems as other Stellarvue 48mm adapters: thin, almost flimsy construction, and a smooth outer finish that is impossible to grasp once installed.
I purchased every M48 extension tube Stellarvue has to offer in order to get the spacing just right for my EdgeHD SCT and I was amazed at the build quality. They are light weight and solid. Combining them allows me to get perfect images without vignetting on a full frame DSLR.