Hexagonal screws for HP 3.5-inch HP screws. | Can make the hard disk shock absorption, mute. | Only applicable to 3.5-inch hard drives, not applicable to 2.5-inch hard drives. | Compatible with DC7800 DC7900 Elite 8000, 8100, 8200, 8300, Pro 6000, 6005, etc. Please ensure compatibility before selling. | Package contains: 4PCS 3.5-inch hard drive fixing screws.