Bosch CLPK21-120 12-Volt Lithium-Ion Combo Kit,Bosch,CLPK21-120" /> The Bosch 12-Volt max lithium ion combo kit comes with the PS40-2A impactor fastening driver and the PS20-2A pocket driver LED light ring on both tools to illuminate work area Quick change chuck on both tools ; Max mode allows pilot and other small bore holes. Reduces user fatigue and 1/4-Inch hex drive with quick release Ps20-2a Features 100-Inch-Pound of torque - drives 100 3-Inch screws per battery charge, forward/reverse button - equally useful at driving or removing screws and 10+1 clutch - enables precision driving and eliminates over torque in soft base materials PS40-2A features 60-Percent more torque than 18-Volt drill and driver - 800-Inch/Pound of max torque, bosch designed hammer and anvil system - delivers 1,800 RPM and 3,000 BPM, spring-loaded impact mechanism