Product Details:

Use When Glass Is Thicker Than 1" (25 mm)

Use the CRL Thick Glass Extension Kit when installing the TTU1 Series Electronic Communicators in glazing material that is thicker than 1 inch (25 millimeter). Extension kit will work on glass up to
2-3/4 inch (70 millimeter) maximum thickness.

Minimum Order:  1 Each

Each kit contains four threads, sleeves and nuts as shown.