This is a medium heat range two-stroke glow plug for all engine applications. FEATURES: Medium heat range plug for most model engine applications. Works well in any engine from .10-size to a BGX. Thick, solid platinum coil resists meltdowns and premature failure. Coil holds sufficient heat for a smooth idle. Finest glow plug in the economy price range. No Idle Bar INCLUDES: One #A3 glow plug One Glow plug ring. Please vist http://www.osengines.com/accys/glowplugs.htmlfor more detailed information