Velo Orange 36 Hole Shimano 8/9/10/SRAM QR x 130 mm Rim Brake Bicycle Rear Hubs
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.
This is hub spacing and is the width of the hub. It must match your frame specifications.
This should correspond to the type of brakes you have on the bike.