The 10-piece set is an all-purpose set for the professional woodworker. It has a great variety of the most popular carbide-tipped bits in an elegant storage case. High quality Micrograin carbide tips that are precision ground provide superior wear resistance and sharp edges for the best finish. Improved hardness uniformity in shank and body resist breakage. 1/2 In.-shank bits give greater stability and LEDs vibration during use, and 1/4 In.-shank bits are more ideal for the thin profiles.