Bosch CLPK22-180 18-Volt 2-Tool Litheon Combo Kit 2X Battery Life With Fat Pack Batteries High torque mode produces over 650 in.-lbs Bosch Litheon Batteries Designed for maximum cyclelife, minimum self-discharge and no memory effect High Strength Metal Collar enhances tool durability and protection when dropped on the chuck Newly Designed Powertrain and Gears increases tool life and durability