In my working life I cut a lot of shim washers with the plastic topped unit above, 1/4 ID 1/2 OD. You gotta be careful though, if you hit the punch off-center it will crack the plastic.
Gasket punch like Randy suggested works well using a hard wood backer or softer aluminum.
My retired tool and die maker neighbor gave me one he made back in the early 50's that works well.
Depends on how thin and what size. Hand punches are great for small holes, larger holes small shears,(tin snips), like jewelers use are good and step drills give an accurate clean hole, easy to trim accurately to a specific width if mark out first.
I watched the Stephan video mentioned above .I made the pieces from cold rolled round and flat. My shims are made from .004 and .006 shim stock. the mandrel was held in the mill collet and the flat piece was held in the vise.They are for a vintage Harley transmission . I am quite happy with the results
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