These slide tube clasps are Lead-Free and Nickel-Free. Available in Silvertone, Goldtone, Gunmetal and Antiqued Copper finishes. Measures approximately 30mm in length. The inside OPENING of the bar is approximately 23mm. These hard to find clasps are perfect for bead embroidery, soutache, micro macrame, loomwork and any specialty projects which require an open wide closure. Sold by the piece.