Hi, Tim.
Roger that. I wore through the 'hard' end of my first one for 3/8's in fairly short order, though I did put it to the task with lots of chains needing raker attention. Just bought three more to have stashed away. They're cheap online if you combine em with something else. My Husky dealer finally started stocking them after I ordered a couple through him and is selling them for 5 bux a pop. (And folks b**ch about Stihl dealer markups!)
The ones that are part of the Husky roller guide combo are harder steel but much more of a hassle to use due to the roller guide being in the way. Didn't we hear somewhere along the line that Carlton or maybe Stens was going to begin offering the File-o-Plate again? Wonder whatever happened to that?
But back on topic...
My 1050A has been waiting patiently for a carb rebuild and since the bench is temporarily vacant it seemed like a good photo op. And maybe this evening I'll finally see if the ancient Tilly kit I bought is even the right one. Has RK-88-HL hand written on the package. The original print is long faded away.