Product Details:

Provides Natural Voice Transmission
Eliminates Drafts

This CRL Stainless Steel Speak-Thru provides natural voice transmission. Offset slots in front and rear prevent tampering from the outside, and stops drafts to the interior. Speak-Thru has a brushed stainless finish, and comes in two sizes. Screws are included that will this item to accommodate glazing thicknesses of up to 1-1/4 inches (32 millimeters) thick.

Color:  Brushed Stainless
Overall Diameter:  7" (178.8 mm)
Required Hole:  3 to 4-1/2 in (76 to 114 mm)

Minimum Order:  1 Each

Important Note:
This speak thru now ships with two sets of screws, one suitable for 1/4 to 3/8 inch (6.4 to 9.5 millimeter) thicknesses, and another set good for up to 1-1/4 inch 31.8 millimeter) thicknesses that can be filed down to suit sizes in between.