Drilling Glass for 1/2' bulk heads

mr.125

Member
So...I ordered the bulk heads and I am doing some practice runs with a 1/2' bit I bought...I can tell that the hole wont accomidate the outside diameter of the bulk head (threads and such)...anybody know what size hole I should be drilling..??
A 3/4 piece of pipe measures aprox. 1' in OD so im thinking the bulk head will be about the same...should 1' be my hole size..??
Also the POS Black and Pecker bit drills the holes lop-sided...

Any sugestions for a better manufacturer that drills nice holes?
1st timer if you could'nt tell~!
 
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