BELL One Power 13mm 20V Cordless Brushless Impact Wrench (Battery & Charger not Included). The iBELL Cordless Impact Wrench is the best in its class. It is a powerful and reliable tool that will make your work easier. With a battery voltage of 20 V, it has a no load speed of 0-3000 rpm and an impact rate of 0-3700 ipm. It also has a maximum torque of 300 Nm. The price is the best in the market and the quality is long lasting.