Trijicon AccuPin Bow Sight Green Triangle with AccuDial Mount Left Handed (Black) Sight aperture uses large fiber for maximum light Clear Fiber offers easily replaceable pin, even in the field Triangle TIP Offers Precision of a "zero diameter" Pin & Large Surface Area to Gather More Light at Low Light Conditions Dovetail Base Slides Directly on to Trijicon's Sight Bracket Rail Grabber Base Attaches to Any Picatinny or Weaver Rail on Other Mounts