Teleskop Service T2 Extension Ring - 3 mm Long

The Teleskop Service T2 (M42 x 0.75) Extender is black-anodized and has a clear aperture of 39 mm. It sports a male t-thread on one side and a female t-thread on the other side. The T2 Extension Ring has an overall length of 3 mm, excluding the T2 external thread. Since this is such a short extension tube, the overall length of the internal thread is only 2 mm.