T500 copper coil size

[WTDist]

Does anyone know the size of the pipe used for the T500 reflux coil. i have my hoses jamed on atm and cant measure it untill i rip it appart.
Looks like 3/8" but i cant be sure. i want to re-use this pipe after i take it out so im just wondering the size of it to make sure i have the right size drill bit.

Cheers
WTD