the shafting i got is pretty common used, for linear bearings to ride on and air cylinders,the first bit i got at the surpluss steel yard they kept telling me "thats stainless steel" ... 8)....then i got some linear shafting online it worked great,ran out, needed more ordered online another couple 5' lengths from a diferent vender,but that turned out to be the hard as fuck stuff that really is un-machinable.i mean you could turn it kinda but it was like 60 rockwell then i just decided , fuck it why not go to the local guy...... hal aye looya i got a 12' stick in 3 days for around 45 dollers