For These plastic clip clamps are extremely handy for all sorts of outdoor activities whenever you need to secure tarps, banners, tents, etc. The clamps are made of extremely durable plastic material, with grip ridges that are adjustable to various thicknesses and lock into place for optimal security. Features of this product include: Pack of 12 clamps Dimensions: 3-ΒΌβ x 1β Strong black plastic material Secure grip ridges that lock in place Extra tying options by attaching clamp to tarp edges