Cone Spikes Screwback Studs DIY Craft Cool Rivets Punk (100pcs 10MM, Gold) Suitable for any custom leather work,like belts, handbags, bracelets, jackets, or any type of apparel item. They are great for dog collars, Punk, Gothic, and any custom leather work. Material: Zinc Alloy. Style: Cone Spikes (with Screw-back). Quantity:100pcs.