Floating shelves avice needed

[Mike13]

Who sells these drill bits for wood in 0.1 mm increments? I found 1 or 2 that are sold for upwards of £70! Is that the going price or do they sell for cheaper?

Just use a metal drill bit to get final size, it is only going to remove 0.1 or so, wont harm the wood or the drill. Mechanics jobbing drill in small increments wont be as expensive as the wood ones.