Amanaote Gun Black Color Copper Spike Studs and Spikes Screw Back Spots for Leathercraft or Clothing Pack of 20 Sets Size: Spike approx 7mm Head x 9mm Height x 9mm Base,Spine stick diameter:4mm;screw height approx 8mm. material:copper. 1 inch=25.4 mm. 1 pcs spike and 1 pcs screw for 1 set Mushroom Bullet Spike Studs Are Suitable for All kind of art and leather Crafts And Clothes making