This is the replacement Thermo Insulator for use with the / O.S. 60B (OSMG2501), and 60K (OSMG2406) carburetors. / / FEATURES: Clear composite plastic / / INCLUDES: One thermo insulator ring / One instruction sheet / / REQUIRES: Attaching to carb base with epoxy / / SPECS: Height:.394"(10mm) / Outer Diameter: .712"(18.1mm) / Inner Diameter: .591"(15mm) / wm 8/13/04 / ir/jxs