for 3.5 inch Disks: Designed exclusively for 3.5-inch hard drives, these mounting screws are not suitable for 2.5-inch hard drives. Vibration Isolation and Sound Damping: These hard drive mounting screws help reduce noise and provide shock absorption. The rubber grommet minimizes vibrations, ensuring smoother and quieter operation. High Compatibility for Machines: These 3.5-inch hard drive mounting screws are compatible with various models including DC5800, DC7800, DC7900, 6005, 6200, 6300, Z200, 6000, 8000, 8100, 8200, 8300, Z40010720, Z400101020, Z4001072010. Best Installation Process: To install a 3.5 inch hard drive, use the four included black and blue M3 isolation mounting screws. Install two screws on each side for optimal balance and support. Comprehensive Set: The package includes 12 pieces of 3.5-inch hard drive mounting screws with washers. Extra screws provide convenience and help avoid additional purchases. Colour: As Shown Material: Iron Package Contents: 12 * 3.5 inch Hard Drive Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3 cm.