Bargain Hope 12 mm Thru x 142 mm 32 Hole Shimano Dynasys 11 Speed Mountain Bicycle Rear Hubs
This is hub spacing and is the width of the hub. It must match your frame specifications.
The hub drilling is the number of spoke holes. It must match your rim spoke count.
The cassette body type is the type of cassette and number of speeds the hub will accept.