Description: Material: aluminum alloy Finish: sand blast Adapter/spacer style: open center Adapter/spacer height: 0.75 inch Application: sqaure bore manifold Reference no: refer 1932 Package Including: 1 set as shown in the picture Adapts most 4 barrel carbs to Quadrajet base manifolds. The bolts are not needed if you are using a Holley, Edelbrock, Demon or Carter squarebore carburetor. They are only need for the Quadrajet carb. If you decide later you want to use this kit with a Quadrajet, you can use the stock bolts or I have another listing that includes the bolts. .