Item description for Perfect Pet Wall Kit for All Weather Dog Door, Extra Large, For 4.75" to 7.25" W

For use with Extra Large All Weather Pet Door–Model #AWXL only (pet door sold separately).
Fits interior or exterior walls from 4.75 inches to 7.25 inches thick.
Complete with hardware and detailed instructions
As with any home improvement project, if you do not have the tools or skills to properly install your pet door, we suggest using a professional handyperson or licensed contractor.