A Mill Bit ID please

I did a bunch of 12" x 12" x 3/8" aluminum plates, by using a wood shaper, with a 1/8" carbide roundover bit. Just fed them in by hand, and took my time. for the 3/8" sides, I stacked 4 together, and fed them as a stack, with 2 C clamps holding the stack together. The bit held up fine, but the bearing gave up less then a quarter the way through. I think it was just cheap, as the replacement held up fine.
 
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