The impact wrench is designed to deliver low torque in 4 stages (10, 20, 30, 40 nm). The use on vibrations and torque will allow easy removal of stuck glow plugs. The level of torque will stop the shearing of the glow plug head. Impact Gun: 20 to 40nm. Deep Sockets: 8, 9, 10, 11, 12mm. Extension Bars 50 100mm. Universal Joint. 1/4'' Drive.