The weight of almost any bat house requires that a mount be used to properly support the box on a narrow pole. This pressure treated mount includes all necessary hardware and instructions. Countersunk holes have been pre-drilled. A 4''x4''' or 4''x6'' pressure treated post is recommended and must be purchased locally. Use at least a 16' long post for 7 and 9 Chamber bat houses, while a 14' post can be used with 4 Chamber sized. A pole mount is not necessary if planning to attach the box to a wide, flat structure, though using spacers between the box and structure is still a good idea. This pole mount may not work with bat houses not manufactured by BCM. Not for use on metal poles without some end user modifications. Please see the bat house manual for mounting tips.