Make sure you have a steady shooting rest in your box blind with the Muddy Universal Window Gun Rest. This bag will slip over the window frame and provide a non marking and solid shooting rest. The Universal Window Rest will also Attach to Ladderstand Shooting Rails! Features Textured, Reinforced, Water Resistant Material Mounts Over Box Blind Window, Shooting Rail, or Fence Rest Sits 2"; High 8.5" Tall x 5" Wide