The Dor-o-Matic 1690/1990 Top Strike PB48 is used on the Dor-o-Matic 1690, 1990 and 2390 Concealed Vertical Rod Exit and Panic Devices. The plate measures 1" x 1-1/16" with 4 holes. The mounting holes are 11/16" x 11/16" on center. The diameter of the pin is 7/16" and projects out 5/32". Ships with mounting screws and 3 shim plates. The Dor-o-Matic Panic Devices have been around since the late 1960’s, but have most recently been known as the Falcon Panic Device from a name change they had in about 2008. They are basically the same device, with the same parts, just a different name plate. Falcon part # PB48.