This is a bag of 20, 7 mm (9/32 inch) cone spike. Each spike comes with a screw for fastening onto clothing, bracelets or anything.

height: 9/32 inch (7 mm)
base: 5/16 inch (8 mm)
color: Gunmetal Black (Silverish Black)
finish: black-nickle
base-metal: brass
shape: round cone spike
screw type: inch- 6-32, 1/4"length