The AP-111UW adapter plates are designed to assist installers in field installations when upgrading older intercom stations. These oversized steel cover plates will overlap the wall opening of many older, obsolete intercom stations. Newer intercom pushbutton stations, or handsets can then be mounted to the AP-111UW using the variety of mounting holes provided. Custom mounting holes (matching the existing wall holes) can be easily drilled at the job site. If you have precise measurements, LEE DAN will drill extra holes for you for a nominal charge! Save money - installation is quick, easy, attractive, and eliminates the need for plastering and painting over the old hole.