Button Spike And Studs Metal Screw Back Spots For Leathercraft Rivets Bullet Leather Clothing Punk DIY Leather Craft (100Pcs, Black) Material: Zinc Alloy Metal Shape: Button Spike, Screw Type: Phillips/ Slotted. Color:Black 100pcs per Pack Size - Height: 9mm, Base: 6mm. Cone Bullet Spike Studs Are Suitable for All kind of art and leather Crafts And Clothes making