The Cameras Extension Kit for Cameras (M48) consists of 10 elements. 4x Extension rings M48 - M48 in lengths 3mm, 5mm, 7mm, 10mm, 12mm, 20mm, 30mm, 40mm and 50mm, which can be stacked in various combinations.
With this extension ring kit several combinations can be made to reach any extension needed for your astrophotography setup.