I had a hard time drilling holes in the concrete floor of my house. Simple anchors, maybe 1.5 inches deep. Quite a number of drill bits were expended on both the Milwaukee 1/2 electric drill/hammer drill (plug) and the Dewalt drill/screwdriver/hammer drill (20V). Drill a hole (it takes a minute) and the drill effectively dulls. This drill bit made perfectly straight and regular 3/8" holes in a fraction of the time. Only 10 holes left to drill, but I feel like I saved enough on drill bits to justify the cost (well , not really, just feel better.) I don't think the battery has drained even one LED level (Dewalt 20v batteries have 3 LEDs to indicate charge status, sold separately).