Needed to see about attaching a light and other things to my printer tent. The rods are about 8mm in diameter. There is a single and double rod clip. I also designed a generic holder which could be used for a camera or light. There are 2 other clips design for a light I picked up at Lowe's. The light has a rechargeable battery, which I leave plugged in. I also has a motion sensor, so it will automatically turn on.