No, they don't have marks. The blade is removable with a flat blade one end & a posi-drive the other. And TBH, I don't think that one has a double blade though the flat looks right. The shaft should be the same length in the handle as outside it as there's a clip-fit in the middle. If not then it's wrong, at least for a P5 & probably the P6 too though I've not had a full P6 toolkit.