White Industries Shimano/SRAM 8,9,10 Speed 12mm Thru x 148mm 28 Hole 6-Bolt Disc Bicycle Rear Hubs
12mm Thru x 148 thru axles are often called "Boost"
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.