DeWalt DW1648 Self Feed 5-Piece Drill Bit Kit for $46.14 shipped. Here is a screenshot for your reference. It features aggressive, replaceable spurs and two-cutter design to cut rough holes in wood. This kit includes a 5.5″ extension piece, 1-3/8-, 1-1/2-, 1-1/8-, and 2-9/16″ self-feed bits. Most places have it for about $64.