Nailheads Spots Studs 2 Prong 9/16" Square; Bright Nickel Finish 100 Pcs 100 pieces 9/16" (15 MM) Square Pyramid Studs; 2-Prong; Steel, with superior bright nickel "ripple" finish. Highest Quality, Heavy Duty Solid Steel; MADE IN THE USA. Fit standard dies, or are easily set by hand on leather and fabrics: cut small slit, insert prongs and bend over Great for biker gear, belts, leather jackets and wristbands, dog collars, bike ornaments, etc.