Our CRL Ticket Window unit is ready for immediate installation. It includes an aluminum framed stationary 1/4" (6 mm) clear tempered glass window, a Cat. No. 834A Speak-Thru, and a Cat. No. 720A Ticket Window. This sits atop a stainless steel shelf measuring 24" (610 mm) wide x 18" (457 mm) deep x 2" (51 mm) thick. Standard unit is shipped unattached to stainless steel shelf. This Ticket Window is also available custom built to your requirements for size and finish. An overhang is recommended for exterior use.