These are lovely little cord ends. They look like they are constructed well. However there's no way on earth they can fit a 1.5mm cord. Assuming that "cord" is defined to be some sort of multistrand textile (as opposed to a wire or a solid rubber), you'll never stuff the end into these things. I tried putting a 1mm cord in. It fit but so snugly that I could not put any glue on the cord first. Since they require glue to be secure, I don't believe it's possible to use any cord that is thicker than about 0.5mm in diameter.