Hedman Hedders 2-1/2 in Gasket-Style Header Reducer w/O2 Bung- 2-1/4 in Exhaust 21126 2014-gmc-sierra-3500-hd-esi2489396 What material and finish is

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Hedman Hedders 2-1/2 in Gasket-Style Header Reducer w/O2 Bung- 2-1/4 in Exhaust 21126 2014-gmc-sierra-3500-hd-esi2489396 What material and finish is2 1 2 in. 3 Bolt Flange O2 Header Reducers for 2 1 4 in. Exhaust System; 3 Bolt Triangular Flange Hedman Hedders 2 1 2 in Gasket Style Header Reducer w O2 Bung 2 1 4 in Exhaust 21126 Specifications: Description_DEF [B@191d3ee6 Description_DES [B@20410202 Description_EXT [B@fcc0a2 Description_FAB [B@19c1ef82 Description_FAB [B@695b1852 Description_FAB [B@41a24669 Description_FAB [B@273d672f Description_FAB [B@311621b5 Description_INV [B@be264d