The Strongest Flexcables on the market. 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.