Genuine Milwaukee C12RAD Spare Parts. Heavy Duty full metal gearbox and gears for superior durability and maximum torque REDLINK™ overload protection electronics in tool and battery pack deliver best in class system durability Variable speed paddle switch trigger for comfortable working in any situation 10 mm chuck for quick bit changes and bit retention Electronic clutch with indicator light for complete control Individual battery cell monitoring optimises tool run time and ensures long term pack durability On board fuel gauge and LED light - added user convenience and illumination in low lit working conditions REDLITHIUM™ battery pack provides superior pack construction, electronics and fade-free performance to deliver more run time and more work over pack life Flexible battery system: works with all MILWAUKEE® M12™ batteries