The Makita DTW450RFE 18V Impact Wrench is powerful, yet compact & lightweight. This cordless impact wrench is powered by an 18V 3.0 Ah Li-ion battery. There is a rubber joint construction for minimum battery failure & the Lithium-ion batteries have a greater life-span than Ni-MH or Ni-Cad counterparts giving you 430% greater run time. Lithium-ions 40% weight saving means 18 Volt power can be obtained by a battery that weighs the same as a 12 Volt Ni-MH battery. The DTW450RFE is run by a powerful 4-pole motor & has the highest in-class fastening torque of 440 Nm 325ft.lbs as well as being the lightest in class at just 3.4kg (7.5lbs).