Items Name: Pipe/tube fittings, like elbows(45&90), tees, corsses, nipples, sleeves, couplings, unions, bushings, plugs, caps, flanges, hex lock nuts, etc.
Materials: Malleable Iron (according to ANSI/ASME A197-79, ISO 5922)
Size: 1/8", 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4", 5", 6"
Standard: According to the BS/AN/DIN, etc.

Types: Galvanized or Black, Carton package usually or as per negotiation
Dimensions standard: ANSI/ASME B16.3-85, DIN 2950, BS143&1256, ISO 49
Threads standard: ANSI/ASME B 1.20.1, DIN 2999, ISO 7/1
All size and specification of pipe/tube fittings is avaliable here.