making your own bars

okay i really want to make my own bars soon and i have a choice of the folowing sizes:

1/2" od x 1.5mm 304 Bright Polished Tube
3/4" od x 1.5mm 304 Bright Polished Tube
3/4" od x 1.5mm 316 Bright Polished tube
1" od x 1.5mm 304 Bright Polished Tube
1" od x 1.5mm 316 Bright Polished Tube
1.1/4" od x 1.5mm 304 Bright Polished
1.1/4" od x 1.5mm 316 Bright Polished
1.1/2" od x 1.5mm 304 Bright Polished
1.1/2" od x 1.5mm 316 Bright Polished
1 1/4" NB Sched 10 304 welded pipe
42.4mm od x 2.5mm wall 304 Dull Polished
48.3mm od x 2.5mm wall 304 Dull Polished
1 1/2" NB Sched 10 304 welded pipe
2" od x 1.5mm 304 Bright Polished Tube
2" od x 1.5mm 316 Bright Polished Tube
3" od x 1.5mm 304 Bright Polished Tube

the first size is the outside diameter of the tube followed by the wall thickness

i will be making them out of stainless steel but i do not know what size i need, please could some one tell me?
 
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