The bosch gds18vliht professional cordless impact driver is the most powerful 18v cordless impact wrench in its class it has very high torque 650nm for tough job applications in metal and concrete it is extremely robust and tough thanks to its all metal gear box and metal tool housing it is one of the lightest high torque impact wrenches available at just 30kg innovative coolpack batteries ensure optimum heat dissipation and therefore increase lifetime by up to 100 cf li ion batterie