This is the Thunder Tiger 6mm Hex Starting Tool. FEATURES: Steel shaft with aluminum base Used with various glow powered helis to start the engine Replaceable base fits into the rubber cone of most electric starters INCLUDES: Thunder Tiger 6mm Hex Starting Tool REQUIRES: Electric starter SPECS: Length: 9" (229mm) including base Diameter of Base: 0.98" (24.9mm) Hex Size: 6mm jxs 11/23/10 ir/jxs