most gurdwara's will have a stall selling them on a sunday

they come in a huge variety of siszes so just go along and try them on

i've got a big fat one about an inch think but i've had that for nearly 20 years but it's been fine other than when it cracked across a stress point and i welded it up again
the weld starts to rust if i don't wear it for ages but it's not soemthng that i tedn to take odf usring the day, only wheni wash or sleep