Product Details:

For Use With 4" (102 mm) Diameter Covered Speak-Thrus
For use with 1/2" (12 mm) Thick Glass

The optional CRL Thickness Adapter Rings are available for the 405 and 410 series four inch (102 millimeter) Speak-Thrus.

Color:  Duranodic Bronze
Diameter:  4 in (102 mm)
Thickness: 1-3/4"(44.5 mm)

Minimum Order:  1 Each

The TAR12 is used for 1/2 inch (12 millimeter) glass, the TAR134 is used for 1-3/4 inch (44 millimeter) doors.