DEWALT DW2735P Drill Flip Drive Kit, 12-Piece Quick-change mechanism enables lightning-quick bit changes 5/16-inch shanks for increased durability Multi-cutter countersinks produce a superior finish with less chipping Easy 1-handed release for quicker changes Kit contains: drill drive holder, drill drive connector, (three) countersink bits, (four) replacement drill bits and heavy-duty container, (three) screwdriver bits