simply place on top of a line post so that the looped opening is parallel to your fence rails and the offset side is directed toward the face of the fence

11-1/2 gauge

Post size fit: 2”

In this case

5" X 5" Neptune Low Voltage Light Post Cap -Copper 4' Ornamental Steel Puppy Panel Flat Top simply place on top ofThese 5 x 5 Neptune Low Voltage LED Light Post Caps combine functionality, beauty, and convenience into one. Designed for 5 x 5 vinyl fence posts, their pyramid shaped chassis provide an attractive top adornment, increasing the beauty of your fence and deck posts. When activated, the LED in the cap emits a pleasant light, creating ambiance and illumination without being overwhelming. You can achieve quite the display with many feet of fence or deck