The APM206MM metal adapter allows your 20.6mm (.8 inch) compatible mount to accommodate a 4-Hole AMPS compatible tablet holder, such as the TAB001-AMPS Slim-Grip Universal Tablet Holder, TAB004KL-B Universal Metal Locking Tablet Holder with Key Lock, or TAB05240 iPad Tablet Enclosure with Key Lock. (Mounts, holders, and devices sold separately.) The metal adapter's construction ensures a sturdy connection to ensure low vibration. This is ideal for commercial or fleet use, especially for taxicabs using HiNT Mounts or other mounts with a 20.6mm mounting pattern. This adapter also includes the NEC 40mm Triangle hole pattern.