Tree Spike Studs and Spikes Metalic Screw Back Rivets for Leathercraft Punk DIY (50Pcs, Black) Material: Zinc Alloy Metal (Lead And Nickel Free), Shape: Tree Spike, Screw Type: Phillips/ Slotted Color:Black Size - Height: 4.72"(12mm),Base:3.15"(8mm) Cone Bullet Spike Studs Are Suitable for All kind of art and leather Crafts And Clothes making Quantity:50Pcs/Pack