The Milwaukee M12 FID Fuel™ Sub Compact 1/4in Impact Driver has a brushless POWERSTATE™ motor and DRIVE CONTROL™ which allows the user to shift to 3 different speed and torque settings. In addition, it features a self-tapping mode to maximise application versatility. REDLINK PLUS™ intelligence system delivers an advanced digital overload protection for tool and battery and uniquely enhances the tool performance under load. Individual battery cell monitoring optimises tool run time and ensures long term pack durability. There is also an on-board fuel gauge and LED light. Flexible battery system: works with all Milwaukee® M12™ batteries. Specification Bit Holder: 1/4in Hex No Load Speed: 0-1,300/0-2,400/0-3,300/min. Impact Rate: 0-4,000/bpm Max. Torque: 147Nm Max. Bolt Diameter: M14