These loop and end clamps (also called hog rings) are made of durable 302 stainless steel. All looping rings are installed with clamp pliers. Use the hog rings for upholstery, splicing elastic cord, and general fastening purposes. Pair the loop and end clamps with C.S. Osborne hog ring pliers. Loop/End Clamp X-2 works with 3/8" cord and comes in a pack of 100.