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This is a pair or iron sights for NATO accessory rail, Picatinny rail, or Weaver rail. This package includes both the front and rear iron sights. These are fixed iron sights without any adjustments.
You will need two #6-32x1.25" screws and two nuts to mount these iron sights to your rail. The screw and nut are not included, but can be easily sourced from your local hardware store (e.g. Home Depot, Lowes, etc.).
WARNING: Although you can use these iron sights on your real firearm, these sights have never been tested with real firearms before. We do not know if the firearm heat/recoil will or will not damage these iron sights. Use it with real firearms at your own risk.