This is a 48 mm extension tube that adds 5 mm of length. The outside diameter is 2.0". The male thread is just under 3 mm long and the female thread is about 4.6 mm deep.
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Like most looking for extensions, I came across the Stellarvue line. I bought directly from Stellarvue as the shipping was cheaper than most resellers, so go straight to the source. I also bought my scope directly from here. I am a Stellarvue customer for life
Made to exacting tolerances using high grade materials as expected from Stellarvue. I am very happy with this product.
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.
I recently purchased 4 different extensions from Vic at Stellarvue. I've come to expect nothing but high quality coming out of Auburn--- which is what I got. I'll be giving this review for the other 3 extensions.