Our hood riser is now available. - Spacer inner diameter measure: 18mm / 0.31" - Bolt length: 45mm / 1.77" - Made of high quality billet aluminum - Constructed from aircraft grade 6061 hard anodized billet aluminum. - Lightweight design - Ideal for rising the hood to increase clearance for larger motor swap application. - Increases air flow to engine. - All parts shown in the picture are included. - Professional installation is highly recommended. (No instructions are included) - Will raise the hood 3/4" - Add this finishing touch to your engine bay and give your car a more aggressive look! ​