I use this product to my external hard drives just to be able to connect quickly and easily in conjunction with a 2-fold Sharkoon SATA USB3 device. If there are several (over 12) external hard drives you have just enough of the housings and wants you a right solution. I did this 2-Bay from Sharkoon and rubber covers for the hard drives. Thus I hardly clutter, I have nothing ver / -entkabeln plate changing, the hard drives are well protected from dust, grease and fingerprints are still well chilled. I particularly like the dimensioning of the rubber caps, one should not the whole hard disk reveal the 2-Bay Insert device. Perfect!