Description: reference no: refer 1933 Package including: 1 set as shown in the picture material: aluminum alloy finish: sand blast adapter/spacer style: open center adapter/spacer height: 1.0 inch application: sqaure bore 4 barrel/holley 2-barrel/large 2-barrel/small 2-barrel manifold Quick and Easy Installation Diecast Aluminum Adapters Includes Gaskets and Studs Including Nuts and Washers Carburetor Flange (application): Square bore Carburetor Bolt Pattern: 4-bolt (5 5/8 in. x 5 1/8 in.) Manifold Mounting Flange: Large 2-barrel .