Brake Bleeder Thickness?

[bosanci28]

I am trying to find out what will the thickness be for the bleeding screws at each wheel for the braking system. Will try to bleed the old brake fluid out and put new one and wanted to get those speedy bleeders so the air does not goback into the system, while a do it.

Have
2013 BMW X5 xDrive 35i (E70) L6-3.0L Turbo (N55)
with 56000 miles.

And normally it should take : DOT 4 ESL fluid.

Any advice on this will appreciate.