Bosch CLPK237A-181 18V Lithium-Ion Hammer Drill/Driver and Impact Driver Combo Kit HDS181A  Durable chuck for better bit retention and great torque transfer HDS181A  Innovative 18-Volt canned motor: more compact, same power 25618  Hard-driving, beefy 1,500-In.-Lbs. of torque 25618  Powerful wrench delivers 3,200 bpm and 2,800 no-load rpm HDS181A  Compact Tough design with a 5.7-Inch head-length and 3.8 Lbs. weight