Congrats!!! Those are three very fine Parker Daedal linear slides!!! On at least some of these slides, the other numbers after the 404600XRMS and 404100XRMS give details about the ball screw, motor mount, and sensors built into the slide. If the numbers are there and you care, I think I have a link somewhere to that data. BTW the "100" and "600" refer to mm of travel.