hey, i just recently made a 3 man bong. i got a sweet vase from a Winners and it was like a cm thick. then we stole a 15$ glass drill bit, it was called a ceramic drill bit and it was from home hardware ( in Canada) it was actually pretty easy each hole took about 5 minutes and every so often we'd spray some oil over it cool it down. put tape over the spots where ur drilling too. i also tried making one before it. the glass was not even half a centimeter thick and we didnt use a glass drill bit. get a glass drill bit for sure