Ticon Industries - 2 Bolt MLSG High Temp Exhaust Gasket 3" I.D. (Qty 5) - Heavy Duty - 120-07610-0005 (3 Inch) Compatible with 3" 2-Bolt Flanges that have a 3"/ 76.2mm Flange ID Bolt hole center spacing 105mm/4.13".Minimum inner bolt to bolt distance of 90mm/3.55" Maximum outer bolt to bolt distance of 121mm/4.76" Fits up to 12mm or 1/2" Bolt hardware Heavy Duty MLSG Construction For Extreme Environments. Multi Layer Stainless Steel and Graphite Construction with a 2mm/.078" gasket thickness. Integrated 2mm/.078" x 2mm/.078" Stainless Steel Fire ring to prevent failure between gasket layers and gasket "Blow Out"