Beadaholique Gun Metal Plated 2 Strand Tube Clasps - 16.5mm (4) Color: Gunmetal Materials: Gunmetal Measurements: 16.5mm long, central tube is 4mm thick, end caps are 6mm in diameter. Rings are 3.5mm in diameter and about 4.5mm apart. Quantity: 4 Pieces Shape: Tube