I went out with a girl, when I lived in Milwaukee, that relationship ended on so-so terms, but remain a good friend of her brother. The brother, up until last year worked for an industrial supplier, in San Juan, PR, that sold cutting tools and other stuff to countries in the Caribbean, Mexico, Central and South America, but for some reason, not the US. He, from time to time, would send me samples, the last group of HSS end mills, he sent me, all had 3/8” shanks, like the ones shown by ACHiPo. They were samples from South Korea, no brand marking, meant to be private labeled by the seller,. He sent a dozen each from 1/8” to 1/2”, in 1/16” steps, in both 2 and 4 flute versions. These were a first for me, up until they arrived, all of my end mill, the shank and flutes, were the same size. They work great, 2 weeks after he sent them, he quit, go to work for M-B, in Argentina.