A steel door frame does not have to be difficult to find. Steel door frames are durable, strong and available in various styles. You can find security steel door frames, stainless steel door frames as well as exterior steel door frames among other products. A reliable steel door can really improve security. There are many different types of steel doors available such as steel glass doors, steel sliding doors, stainless steel doors as well as steel front doors, so you won't have a trouble finding one that suits your needs. 
Therma Thru Adjusta-Trim Steel Door Frames
"Ideal for exterior residential openings, like public or military housing, where a standard size storm door is required. The only pre-hung steel door frame system with built-in trim. Commercial-grade 16-gauge base frame, heaviest gauge available for split adjustable pre-hung steel frames. 20-gauge closure with ½" of adjustability, suitable for walls from 4 1/8"-10" deep. All frames fabricated from galvanized steel, factory pre-coated with multi-layered paint finish for superior rust inhibition. Factory top coat available." 
Therma Thru Steel Entry Door
"Our 20-minute fire-rated doors are available in five ready-to-paint decorative designs, with tough 24- and 25-gauge smooth steel and polyurethane foam core for durable energy efficiency. All doors feature a solid wood lock block for secure mounting of hardware, decorative glass options, and a five-year limited warranty." These doors can be found at thermatru.com
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