These rod end boots slip over the rod end to protect them by sealing out dirt and moisture.
The same boot fits, either a male or female application.
They come in two sizes and are sold as each.
Size REBOOT-S will fit 3/8", 7/16" and 10mm, 12mm rod ends.
Size REBOOT-L will fit 1/2", 5/8", 3/4" and 14mm, 16mm, 18mm rod ends.