Round 6" diameter cast stainless steel talk thru design offers natural voice transmission with evenly spaced concentric louvers. This unit is available as interior or exterior model (specify). Gaffco Model GS-34 Talk Thru is adjustable for 1/4" to 1 7/8" thick glass. Glass thickness less than 1 3/16" requires optional spacer ring.
When ordering indicate glass thickness of window.

Requires 5" diameter hole.

Class III bullet resistant.