Best drill bit for vitreous china (WC)?

[bazzyboy]

What's the best drill bit to drill a 5mm hole into the 15mm-thick side of a vitreous china WC (toilet tank) or toilet tank cover. Once drilled, I'll insert a flexible water tube through the hole to connect the water outlet inside the WC to the bidet using a T adapter (3-way valve.)

 

 

 

  

[arshmuglani]

Thanks for that link mate. I'll give them a call tomorrow and explain them my scenario. 

Thanks alot for the help mate.