Adel LED Display Keyless Biometric Fingerprint Door Lock Trinity 788 Three way to unlock: Fingerprint, Pin and Key Fits a USA standard 2-1/8" diameter hole with a thickness of 1-5/32" to 2-3/8" Easily add or delete individual users directly on the lock. Up to 99 fingerprints capacity. Super easy to install, easy to program and works great. A great solution to control access to single rooms