Bought these to see how they would work on my overlocker. They threaded realy easily (by tying them to the old threads and pulling them through - good trick!!) onto the machine. To my surprise, the slightly thicker thread (my previous threads were quite thin) appears to work better and produce a nicer stitch. This thread also stitches in a range of different colours which means that I can use it to overlock a whole range of coloured fabrics without having to change spools all the time. I was going to use these on a coverstitch machine but, as the threads would be visible from the top of the fabric, I thought that this wasn't such a good idea unless the fabrice being stitched was multicoloured. Good quality thread at a good price. It is slightly thicker so you would need a slightly larger needle (90/14).