The support is for a ladder line (G5RV ect.) and fits inside of a 1 inch schedule 40 PVC pipe for the cross arm support. The part insert is about .82 inches. There is a hole at the end of the holders to place a wire tie or a bolt to secure the end. I will be printing a beefed up version soon. The 2 holder arms will be much thicker. If you need one with a thicker insert let me know and I will post it for you. These were printed horizonal in PLA.