Clover Wonder Clips 50 Pieces Open wide for holding multiple layers of fabric. It won't damage or distort the fabric. Great Holding capacity for different types of crafts. 1/4" and 1/2" seam allowance markings on on the base of clip of clip. Clip base is flat for easy feeding to presser foot. The Wonder Clips are great alternative to pins, especially when working with heavy weight fabrics, piles, and vinyls. It can hold layered sections of sewing projects such as handle connectors to handbags and piping without distortion. It holds quilt binding while sewing and it's easy to see and easy to find when dropped on the floor. Works well with sergers.