Side A: 2" ID (Inside diameter) Side B: 2.25" OD (Outside diameter) Overlenght: 5" Material: High quality stainless steel; Surface: Mirror polished finish Application: Universal fit for all exhaust/turbo/intercooler/intake piping connection Our stainless steel reducer are the best solution to connect your different pipe size together, feature with wide range size, high quality stainless steel, 5" overlength are enough for any of your applicatoin.