Based on my observations this product is a complete waste of money. Although it CLAIMS to be adjustable, the holder doesnt hold the wires properly. The porcelain material may be sturdy, but it's not worth paying extra for. As an industrial and scientific user, I expected better quality. The only pro is that it looks nice on the shelf.The cons outweigh the pros: it's expensive and unreliable. Save your money and invest in a better wire holder..