Bosch 37618-01 18-Volt 1/2-Inch Brute Tough Litheon Drill/Driver with 2-Fat Batteries 1/2-Inch metal chuck for increased durability Features 0-425/0-1,800 rpm and 650 in-Pound of torque Features Bosch durasheild housing and uni-body power train to withstand real world conditions Bosch litheon batteries-state-of-art lithium-ion battery technology coupled with Bosch's proprietary ecp (electronic cell protection) system guarantees the optimal performance of tool and batteries even for tough work conditions 25 Position clutch