Inexpensive Borosilicate Glass Butcher's Steel
If you have any double bevel hand forged Japanese knives, chances are that the knives are tempered harder than your butcher's steel, rendering the steel useless on them.
There is one craftsman out there who makes a 12" borosilicate glass steel, but it is $60 and it is usually out of stock.
So I made my own. I used a 12" laboratory stirring rod and an old paint brush. I sawed off the bristles, drilled a hole in the handle and attached the glass rod with epoxy and mighty putty. It is quite strong, not brittle and boroslicate glass is harder than any steel. It gets the job done and I think the glass rod was something like $1.95.