DEWALT DW1648 Self Feed Kit 5-Pieces Aggressive spur provides fast material penetraion Optimized cutting geometry provides longer bit life Open tooth design allows for more resharpenings 7/16-inch Ball groove shank for quick change applications Includes 5-1/2-inch extension, 1-3/8-, 1-1/2-, 2-1/8-, and 2-9/16-inch self-feed bits, replacement parts, and kit box