Lowes offers Bosch 18-volt 1/4-in 1/2-in Brushless Cordless Impact Driver for $79 (reg. $179) free shipping.

Product Description:
The BoschGDX18V-1800 Two-in-One 1/4 In. and 1/2 In. Bit/Socket ImpactDriver/Wrench is for use with bits and sockets, going from impact wrenchto impact driver fast. It lets you do two jobs with one tool, with thetwo-in-one bit/socket drive that offers a 1/4 In. quick-change hex shankholder with power groove for bits, and a 1/2 In. square drive forsockets. The impact driver/wrench’s efficient, powerful brushlesscordless motor produces up to 1,800 In.-Lbs. of torque, while the Boschhammer-and-anvil system provide maximum impact energy and up to 0-4,200impacts per minute. The variable-speed trigger provides accurate drivingspeed. The two-in-one bit/socket drive increases both convenience andpower. Bits can stay conveniently inserted when using deep sockets, andmore torque is transferred directly thru the 1/2 In. square drive anvil.There is no more torque loss through socket adapters or broken socketadapters. The driver has an LED light to illuminate the work area. Thekit comes with one 18V 2 Ah Standard Power Battery and an 18V charger.