Dont make a hole with a knife!!!

[Bumble]

When making your bong don't use a knife as it will split the bottle. yor best bet is to buy your self a clipper lighter.
Heat the area of the bottle where you want your hole when theres a little hole just burnt take out the flint of the clipper and poke it through it makes the perfect hole for the average roach size!!!

[Big Paz]

Or if u don gota clippr a pen will do !!!

[Guest]

save time n gently heat the bottle or whateva (not paper of coarse!) then wen soft enuff push and twist your pipe/tutor or woteva thru and there u go perfect hole perfectly air tight (sum times watertight!)
also if ure tutors metal shud be heat this then do same as abuv also works well

[Stanky]

you must be talking about glass and if so how do you melt a hole in glass? Ive got tons of things i could make

[jonny cockeral]

its not often you can make holes in glass without it shattering. you need to heat it up. its normally done by profesionals that blow the glass, its called glass blowing. i wouldnt try it at home.

[Luke]

dude... glass has to be SO hot to be molded