Review on Rotary Hardware Accessories with Dynamic Flexibility by Jacob Ferrarini

Limited utility. Operationally good. Works well if you just need a simple flexible shaft. No interchangeable collets or collets from other manufacturers will fit. Therefore only bits with 1/8" shank are used, and please don't lose the collet. I don't know where to find another collet for this bar if it's lost or broken. If you bought it with all the knowledge then this is an offer at 1/4 the price of the national brand.