Pixnor 100pcs 79mm Metal Cone Spikes Screwback Studs DIY Leather Craft Punk Style Rivets (Silver) 100 pieces of the DIY cone spikes screwback studs in one set will be sold together. Color: silver. Material: durable aluminum alloy. Size: about 7mm (diameter)*9mm (height). Each cone spikes studs is equipped with a screw, for easy to use. Great for decoration on necklace, DIY bags, shoes, jackets, etc.