Thumbscrews enable convenient, tool-free access to the PC system and internal components.Designed for easy mounting and quick removal of PC chassis panels, PCI case backplates and hard drives.Thumbscrews are not only more practical, they look better than standard screws.Specifications Coarse thread for standard chassis, HDD and PCI backplates 4 Stainless steel screws Easy grip designWhat's included 4 x Atrix PC case thumb screws