Since the hub has two bearings (one pressed into each side of the aluminum housing) it eliminates the need to mount two bearings separately.
By simply bolting this hub to your structure, the bearings are sure to be in-line with one-another and they can handle a cantilever load on the shaft.
The Dual Ball Bearing Hub has both tapped and thru-holes to increase its mounting options.
The thru-holes have counter-bored holes to allow socket head screws to set below the surface and out of the way of moving parts.
This hub uses 6-32 socket head machine screws (sold separately)