One flute design provides increased chip clearance for fast cutting (DW6601, DW6605, DW6609) * Left-hand spiral directs chips and dust into wall cavity for a cleaner work environment (DW6601, DW6605, DW6609) * Piloted bit allows for effective cutting around outlet boxes and other objects (DW6605, DW6609) * 1/4-inch diameter shank provides increased durability (DW6609). * Includes 10 piloted drywall bits per pack