The TW001GZ01 is a compact cordless Impact Wrench, powered by 40V Max Li-ion XGT battery (not included) to supply energy to the powerful 40V brushless motor, with variable speed controlled by trigger, to deliver up to 2, 500 ipm, 1, 800 rpm, 1, 800 Nm maximum tightening torque & 2, 050 Nm nut busting torque for high performance in continuous heavy duty applications. The TW001GZ01 is equipped with electric brake to stop the rotation gently but quickly for increased operator safety, forward & reverse rotation, electronic 4 stage impact power selection for maximum, hard, medium & soft & twin LED job light with pre-glow & after-glow. The TW001GZ01 features trigger switch with full speed mode. The variable speed mode can be changed to full speed mode by simply pushing a button; trigger travel is shorter in full speed mode therefore full speed will be reached faster & auto-stop system; available in both forward & reverse rotations. The TW001GZ01 stops after the bolt/nut is loosened enough. Driving shank 34;” square (C-Ring). Standard bolt M12 to M36, High strength bolt M10 to M27.