Industry Nine 15mm Thru x 110mm 28 hole 6-Bolt Disc Bicycle Front Hubs
About Industry Nine - "Industry Nine hubs are handmade in Asheville, NC"
This is hub spacing and is the width of the hub. It must match your fork specifications.
The hub drilling is the number of spoke holes. It must match your rim spoke count.
This should correspond to the type of brakes you have on the bike.