Any router bit that fits the router collet (or collets, for more capable routers with larger and smaller collets) should work. In a few cases you have to make sure the maximum rated speed of the bit (typically for large diameter bits) is not less than your router's speed (or speed setting, if adjustable speed.)

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Which either means you get a 1/4" collet (6.35mm) in Great Britain, or the 8mm size collet (0.315 inches) is delusionally called 1/4" in Great Britain (I don't know which, and it would matter.) A mere 26% difference in diameter...

I assume the "8mm" in the description refers to the size of the bit I can use. Do I need to buy DeWalt branded bits or will any fit?

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