40 Pieces of Silver Chrome Screws with Black, Red,Blue or Green Rubber Grommets for Hard Disks & other devices, vibration & noise reduction, fast shipping Silver Chrome Screw Size: 3mm X 8mm Rubber Grommet Color choices available: Black, Red, or Blue, or Green - please email us for your own color combination, or we will ship random colors Total 40 silver chrome screws and 40 rubber grommets, good for installing 10 hard disks or other compatible devices Great at reducing vibration and noise from hard disks, also enhance the longevity of the hard disk