The Tru-Aligner is specifically designed for use with the popular angle mounted aluminum peep sights like RAD's Super-Deuce 38. When served together with Super-Deuce 38, it is simply the best self-aligning peep combination available. The aligner and peep are served together in the string to become a single unit. This provides archers with the security of self-alignment, the true round aperture of the angled mounted peep, and no string twist between aligner and peep. Standard model for use with standard diameter angled mounted peep sights.