This 15-pack of 1/2" - 1" ground clamps have a copper alloy body (image not exact), brass screws (image not exact) and ground wire size (AWG): 10 to 2. CSA approved for wet locations and for direct burial, applications include: ground rods: galv. steel: 5/8" to 1" reversible; copper clad: 5/8" to 1"; and pipe: 1/2" to 1". **NOTE** Image not exact, image is of one clamp only.