3 mm.
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A 3mm bead is half the size od a 6mm bead, however in welding you have to also add in penetration. A 3mm bead with a penetration of 100% is equal in size to a 50% penetration 6mm bead. 1/2"*3mm=1.5mm; 1/4"*6mm =1.5mm
3mm = 0.12inch.
19.5 ring size is
3mm = 0.3 cm
You can get your ring size at a jeweler, wait for a physica ring sizer in the mail or find your ring size online using a website such as httpP://FindMyRingSize.com