Measuring 18" in length and 1" in diameter, this is a solid threaded steel rod. Profile spacing is square with the expected finish for this price point, which is rough. A light lube is needed for a smoother ride, it doesn't spin easily with dry threads, it's a heavy piece. I use Super Lube synthetic lube for general purpose items, it's very good. I assume it will eventually bond with the wood dust. If you've wasted your time breaking the sharp edges of the thread, it makes feeding easier, butโฆ