Review on WORKPRO W032005 Steel Spring Clamp by Walter Velasquez

I took a chance but had to trust past reviews. The coating of these clips is not the same as shown in the photo. It's very thin, hard and smooth - plastic, not rubber. I was planning on using them to stretch the fabric on my quilting machine but they are slipping off. Other spring clips I've bought in the past have a thick rubber coating that holds up well. Not this one. They are strong and run smoothly, but slip when force is applied.