One integral unit keeps everything together, no lost parts. Ergonomic contoured finger grip for comfort and more control. Quick and easy changes between drilling and driving, one step loading and multi-cutter countersinks. Easy push forward for one-handed release.Quick and easy changes between drilling and driving allows user to finish jobs fasterQuick-change mechanism for easy one-step loadingMulti-cutter countersinks for exceptional finishOne-integral unit keeps everything together and no lost partsBlack oxide split-point drill bits start on contact5/16 in shank for added durabilityEasy push forward for one-handed releaseContoured finger grip for easy ergonomic use