The CRL Cashier Window unit has a stationary tempered 1/4" (6 mm) clear glass window surrounded by a satin finish aluminum frame. A Cat. No. 834A Speak-Thru is supplied with the window, and the unit is mounted on a stainless steel shelf with recessed coin and cash tray. The shelf assembly measures 30" (762 mm) wide x 18" (457 mm) deep x 2" (51 mm) thick. The entire unit is ready for immediate installation on receipt. An overhang is recommended for exterior use.