The Tower Power Glow Plug is a Medium Length Plug Designed for Two-Stroke Engines. FEATURES: Medium Length, Medium Heat Range Plug WITHOUT IDLER BAR. Works on All 2-Stroke Engines, even .15 and smaller because it does not have the Idle Bar that would normally hit the top of the piston INCLUDES: One Glow Plug One Copper Gasket REQUIRES: Glow Plug Wrench (suggest HCAP2550) mgc 10-7-98 ir/jl