Small keyway wheels needed

Can anyone suggest a supplier of wheels which must have ...
a) an outside diameter of between 12 and 20cm
b) a hub bore of 15mm, with 5mm keyway, or with enough metal/plastic to make machining a keyway possible
c) reasonably grippy tyres: plastic / rubber / pneumatic
d) hub length 25cm maximum (or machinable down)
e) load capacity 75kg
Ian
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http://www.alexander-industrial.co.uk /
they'll also make to measure, or advise you further.
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http://www.citybearings.co.uk/castors.htm
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Last one I promise:
http://www.bazroll.co.uk/information.php?content=intro
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