I have used them more for garment sewing....I know, not much help. But I have used them to sew blocks tog.but I only use about 4 and no more than 6 or 7 because then there are too many hanging on my lap. In other words, I like them better for chain sewing, but only doing 2 blocks...a big maybe...3. They are nice though. I do like using them on binding...I have also bought the bigger greens ones and I've those on the binding also...again...I only use about 4-6.