Wonder clips'the name says it all! These are such a help when you need to hold together layers of fabric, can't use pins when sewing with oilcloth, need adding binding or piping, want to seam your knits, etc.
The backs of these clips are flat, so works well with sewing'just remove them before feeding fabric under the presser foot. They have 1/4' and 1/2' seam allowances marked on them for ease of use.
These do offer a great holding capacity for many crafts.