A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
ATD Tools Socket Set, 44 Piece
44-piece 1/4" drive socket set contains (1) each of the following pieces:
1/4" quick release ratchet (12001)
2" extension bar (12002), 4" extension bar (120049), 6" extension bar (12003)