EDIT: Sorry, it's gone! Ok, I have a 4" round cabinet Port I ordered by accident, I clicked the wrong item. Port length is about 4 ", and it is black plastic with a radiused front edge. Pic down below. I don't need it, and it needs a good home, so I will send it FREE to any TB supporting member who would like it in his or her DIY junk closet. PM me the mailing addy, and it is yours as an extra reward for your support.