1) Flange varieties: plate, slip-on, welded neck, blind, thread 2) Materials: carbon steel, stainless steel, alloy steel 3) Standard: ANSI, ASME, JIS, DIN 4) Size: 1/2"-5,000mm 5) Surface treatment: transparent oil, rust-proof oil, hot galvanizing 6) Price: very competitive 7) Special design available