Dangerous Threads Nailheads Spots Studs 2 Prong 3/8" Square Pyramid Studs - Various Colors - 100 Pcs (Antique Nickel) 100 pieces 3/8" Square Pyramid Studs; 2-Prong; Steel 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. Choose your color: Nickel, Matte Black, Antique Nickel, Antique Brass, or Mixed (Mixed will contain all 4 colors but will be a random assortment - NOT an equal amount of each color).