This comes in 4", 8" or 12" spindle that fits a 3/4" arbor, the new twisted steel is made for heavy distressing on hardwoods. Its heavy and that is why we put in on a spindle that goes to a motor. The motor should be 1-2HP and have variable speed if possible.
The twisted steel has a very long lifetime compared to other rustic brushes from Quickwood because of its setup and the twisting of the steel also makes it more aggressive on the wood. This spindle should run from about 200 rpm to 800 rpm and a variable speed on the motor would be a great idea to keep the digging of the wood where you want it.