This is the Sullivan Heavy Duty Tiger Drive 6mm adapter for Duratrax engines.
Requires: 7/32 starter probe SULG6086
Note: Fits most engines .12 to .18 with a 6mm starting shaft. This includes Torq .12, Torq .16 and Velocity .15 +.17. Also works on the Traxxas .15 engines (not for the 2.5 engines). As well as HPI .12 and .15 engines. Not for use with O.S. Engines or the DTX .18 which uses an 8mm starter shaft or bearing.