[Package] Including 30 pieces computer case thumbscrews, size: 15 mm * 9 mm. | [Material] Made of high-quality and high-hardness iron, it is durable and not easy to be damaged. The surface is painted and not easy to rust. | [Convenience] These screws have a deep thread design, which is convenient for you to tighten by hand. | [Cross Head] These screws have a cross-recessed head and are suitable for most conventional screwdrivers. | [Application] Thumbscrews are ideal assembling tools, very suitable for assembling and repairing personal computers.