These brand new 100 pack package of stainless steel 3/8" round spots are great for outdoor use and horse tack. They are weather resistant and will not rust. This item 1330-26 has prongs that also measure 1/4" long. The prongs go threw the leather or fabric and are bent in or out to secure them in place. A sharp craft knife or single prong chisel sold separately in our store will aid in setting the spots prongs. Please feel free to message with any questions. Thank you for looking.