Quartz Tube, Fostoria, Size- 5/8 IN, 120 V, Frequency Rating- 50/60 HZ, 450 WTT, Style- Coiled Element with Porcelain End Caps and Pigtailed Termination, Insert Length- 12-15/16 IN, Housing Quartz. For Use With FFH-912B Electric Utility Infrared Heater