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It's called a shrink fit or interference fit.....usually a 0.0005 - 0.00025 smaller I.D. than the SHAFT's O.D. the collar MUST be heated, then it'll just drop in place and when cooled, it will not move.....just my opinion...The collar is to lock the bearing on the axle. Old time mechanics call it a wedding ring. My main advice is that you install the ring correctly, it must be heated, before pushing it on against the bearing. If you don't heat it, it may distort and not hold the bearing in place properly. The ring is a onetime use device, if you press it off it is junk do not try and reuse it.
BOB RENTON