"Wonder Clips" from Clothilde. Open wide for great holding capacity and won't damage or distort fabric. 1/4" and 1/2" seam marks on base, which is flat for easy feeding to presser foot. Better than pins for heavy fabrics, piles and vinyls. Holds layered sections of projects such as handle connectors to handbags and piping; holds quilt binding to quilt; easy to find when dropped on the floor.