TOOGOO(R) 10pcs Dragon Claw Spikes Studs for DIY Craft Leathercraft--Matching Screws Included Used for a unique spiked embellishment on your custom projects Screwback spikes come with screws for fastening onto clothing, bracelets, or anything Claw spikes are commonly used for dog collars, Punk jacket, bracelets, Goth apparel, etc Base Size (L x W): Approx. 11 x 10 mm; Height: Approx. 17 mm Material: Aluminum