This is a sight insert for the old discontinued AXT/Hoyt bow sights, it fits multiple of their sights but not all. I use it on the 4 pin slider. It isn't perfect and could use some tweaking but it fits pretty good. After the print I drill 2 small holes in the ears where the bolts go to hold it in (top and bottom of sight scope). I made this because I wanted to change the color of the insert but didn't want to paint it, and finding new old stock inserts is nearly impossible.