The DTD154 heavy duty impact driver features an ultra-compact design at just 117mm long and a brushless DC motor. It offers an electronic 3-stage impact power selector and TEK mode selection to prevent over-tightening of fasteners. With a high rotational speed of 3,600rpm and a max torque of 175Nm, it is a top performer in its class. The DTD154 is powered by an 18V Li-ion battery. Key features include T-mode for self-drilling screws, electronic 3-stage impact power selection (Hard/Medium/Soft), a brushless motor, one-touch sliding chuck for easy bit installation, an LED job light, an ergonomic soft grip, electric brake, variable speed control by trigger, and forward/reverse rotation. It has a compact overall length. This is a bare tool, meaning no battery or charger is supplied. Specifications: Bit Holder: 6.35mm (1/4in). No Load Speed: 0-1,100/0-2,100/0-3,600/min. Impact Rate: 0-1,100/0-2,600/0-3,800/bpm. Max. Torque: 175Nm, 3 Stage + T-Mode. Capacity: Machine Screw M4-M8, Standard Bolt M5-M16, High Tensile Bolt M5-M14. Coarse Thread Length: 22-125mm. Weight: 1.2kg.