Teleskop Service 2" Extension with M48 Filter Threads on Both Sides

This 5 mm Extension Ring has 2" (M48) filter threads on both sides; male on one side and female on the other. This allows you to extend the barrel of a 2" eyepiece or other accessory by 5 mm, and still have threads available to accept another extension ring or filter. The Telescope Service 5 mm Extension Tube is made of metal and is black anodized. The M48 female filter thread length is 4 mm.