Features:Seamless fit, durable construction, ensures optimal exhaust flow efficiency. good for custom exhaust systems.Material:Durable heat resistant T304 Stainless Steel material. Durable: Not easily damaged, No rust, anti-oxidation, Mirror polishingSpecification: Product Name: Mandrel Exhaust Bend Elbow Concentric Reducer Tube Design: Cutted Material: T304 Stainless Steel Color: Silver Tone Tube Angle: Straight Input Outside Diameter: 4inch/102mm Output Outside Diameter: 5inch/127mm Overall Length: 5inch/127mm Easy to install: Clean the Exhaust Pipe Adapter Fit the connecting pipe and exhaust pipe together You may require tools like a wrench for removal and installation if needed Please Note:Professional installation is highly recommended. Please check the detailed size before purchasing it.Package included:1 Pc Mandrel Exhaust Bend Elbow Concentric Reducer