DT Swiss 28- Hole 6-Bolt Disc Bicycle Rear Hubs
About DT Swiss - Driven by the vision of becoming a worldwide known manufacturer of bicycle components, DT Swiss expanded its product range over the years. Today DT Swiss has established itself as a leading manufacturer of spokes, nipples, hubs, rims, complete wheels as well as suspension systems.
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.