Reverse Wind Flex Shafts for opposite rotation engines and electric motors. Same strength as our standard rotation cables. Come in a variety of sizes to suit all your drive needs. Precision ground and hardened threaded stub shaft welded on (also available separately). 3/16" Stub threads are 10-32. 1/4" Stub threads are 1/4-28. We also offer stepped down stubs to accommodate the use of common props for shaft size. Years of testing and customer proven, these shaft WILL NOT break even under the most strenuous circumstances. Some sizes not available. Please be aware shafts MUST be used with reverse rotation (right hand) Props.