3/16 good buy I'd say,,but you'd need a pretty big welder to use them,,,180-190 amps worth? dcep,,,,plus you need a bigger air compressor,,3-4 h.p?,,,the 5/32 you can get by with maybe 160 amps and a 1 1/2 -2 hp air compressor,,using dcep,,also you got to remember that duty cycle thing for you welder,,,thingy