Or maybe pferd are smaller than they say, I bought one of those pferd csx file holders..one that files the tooth and drag at the same time.. wore out the files (7/32) and went to put in a new oregon 7/32 and you could not drive it in there... dug around in my box and found a new chinese file I bought at home depot one day when I was in a pinch and it worked perfect.. I actually tried 2 oregon files and neither would think of going into the holder..