Associated's Factory Team 3/16" nut driver is a perfect fit on them - what you can also do is change them for the socket head versions like on the B44, these are a bit easier to reach.
I have the Schumacher medium (green) inserts on my car and I find them fine - but I haven't done any comparison tests. In terms of filling the tyre and supporting the carcass, they do a good job - the old Schumacher blues didn't, they were too narrow.
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