This picture shows the box with the connectors installed and the actual choke assembly. The choke is made of 18 ferrite rings organized in a "binocular core" of 2 rows by 9 rings and it has 3 and a half turns of coaxial cable thru the core. One turn counts as the cable passes thru both rows of rings. With 3 and one half turns the cable exits the core from the opposite ends. The inside diameter of the rings (18 mm) is just big enough to fit 4 turns of the cable and the spacing between the two ferrite "tubes" allows for the bend radius of the cable to be above the specified minimum bend radius of 3/4".