This series is offered in both brass and stainless steel. The body style is hexagonal. This burner has a 7/16”-24 thread to fit both the Carlisle High Capacity Hand Torch and the 3A National Hand Torch. The NOX series has 5 tips numbered 1 - 5. The NOX larger numbers signify a larger center drill size and a greater flame output. 1/2" hex body with 7/16"-24 F thread.