The DeWalt DW1649 8 piece self feed bit kit features a two-cutter design, and makes drilling easier and faster. If you are cutting holes for plumbing or electrical purposes, this self feed bit kit is just right for you. Rugged and sharp, these self feed bits can also be re-sharpened to continue giving the best cutting and drilling results. The spurs penetrate the materials faster and the screw is self -feeding, thus saving you trouble. The spur design of this drill bit kit promotes longer life and the tooth design lets you re-sharpen the self feed bits more number of times. The shank flats not only prevent bit slipping in the chuck, but also offer better retention. The 7/16-Inch Ball groove of dewalt tool kit shank makes for quick and easy changes in different applications. The DeWalt DW1649 8 piece self feed bits ensures you can drill freely, without the fear of the screw getting "gummed up" in pressure treated wood.