Gmc router

Any one out there know any thing about the GMC Q01034 500 watt router, is it possible to go from the stock 1/4 inch router bits to either 3/8 inch or 1/2 inch router bits. Having the same problem with the Makita router as well. The replies i had were much appreciated, now for the GMC router. Yes i have 2 of them.
All help will be much appreciated
Peter
Australia
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model. Call the supplier, or maybe the store you bought it from. We can't see them from here.
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