weight lifting equipment questions?

i have 140 lbs in weights including the bar and all the weights have a 1" hole in them for the bar, but the bar is only 20lbs. I want a heavier bar but i dont know if they make a 45 or 50lbs bar thats is only 1"
kus the only ones ive see that weight that much has those huge ends like the golds gym bars have. so do they make heavy bars that are 1" and where can i find them.
what do i look up to find them on the internet
thanks alot

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