1″ (25mm) stainless steel Hobble/Rug Buckle. A centre bar buckle with roller for smoother strap tightening.Stainless Steel is a strong metal that does not readily corrode, rust or stain with ordinary water. Its strength, durability and shiny grey-white appearance make it a popular choice. Hardware sizes are intended to indicate the maximum strap size to be used. As a general rule, measurements are taken from inside-edge to inside-edge, on the side the strap would pass through.