Gun Metal J2 Aluminum JDM Header Manifold Cup Washer+ Bolt Kit Accord CG Prelude BB Washer Size: 0.50" (Thick) X 0.75" (Diameter) Hex Bolt Dimensions: 1.25" (Length) X 0.50" (Diameter) Comes with 9 Aluminum Header Washer Kits and 9 Mounting Hex Bolts Application: 1990 - Present Honda Accord 4Cyl/1992 - 2001 Honda Prelude/(Fits 4Cyl Models Racing Header Only) Professional Installation Highly Recommended (No Instructions Included)