DEWALT DW6603 1/8-Inch Drywall/Outlet Bit, Pack of 10 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).