18-Volt ONE+ Lithium-Ion Cordless Hammer Drill and Impact Driver Combo Kit for $129.00 shipped. Here is a screenshot for reference. The 18-volt hammer drill features a variable 2-speed transmission and delivers up to 1500 and 19,500 BPM. The 18-volt impact driver also has a variable-speed trigger and delivers 1500 in.-lbs. of torque. Note that this bundle also includes two 18-volt ONE+ compact lithium-ion batteries and one 1-hour intelliport charger. At the time of this post, this bundle has been recommended by all customer reviews.