Recommended for most current O.S with nitrometane. (and other brands of) 2-stroke R/C engines. FEATURES: -Cold heat range plug for most model engine applications with Nitromethane. - Plug is medium length, without idle bar. For all 2 stroke engines with Nitromethane. INCLUDES: One glow plug and one brass washer SPECS: Threads on the plug are 1/4-32.