THIS IS A PAIR OF FRONT WHEELS. YOU WILL NEED THE KG1 HUBS. IF YOU HAVE AN AF TRUCK THE STOCK HUBS WILL NOT FIT THESE WHEELS AS THE BOLT PATTERN IS SLIGHTLY DIFFERENT.
 
CKD0601 KG1 KD004 DUEL CNC Metal FRONT Dually Wheel (2 pcs, w/cap. decal & screws)
This is a CNC metal wheel which will fit F450 DL Series
Please do aware that this wheels is for FRONT application.  
CKD0602 is for the REAR application.
They do have different offset!