Kitchen worktop joint

[Peter James]

Hi,
I am joining some timber worktops using the normal tie rods. However, because I only need to do a couple I am not purchasing a jig. I plan to route the straight line for the bar; and then drill the wide holes at each end to hold the fasteners (the end dumbells).
What diameter should these holes be? I am guessing around 30mm or maybe a bit bigger.

Thanks

 

[foxhole]

30mm will be fine

 

[Peter James]

30mm will be fine

Thank you. Should I use a Forstner or a flat wood bit? Or hole saw?
The timber is 69mm thick so need to go to a depth of 40ish mm.

 

[foxhole]

Might as well just route them.