This is no ordinary drill. This is Bosch. He's ready to break through concrete and rebar with about the same hesitancy as your mother-in-law invites herself over to dinner. While other drills have two heads, this one has four heads, allowing for simultaneous cutting on all sides. Before ordering this or any other Bosch SDS Max bit, make sure you have an SDS compatible tool like this hammer drill as SDS will not fit in your standard chucks: https://www.amazon.com/Bosch-11255VSR -SDS-Plus-BULLDOG-Xtreme/dp/B000BB79Q6