Ergonomically designed to give maximum power thrust High productivity achieved by using efficient Brushless DC motor Variable speed control by trigger DTW285Z features: Variable speed control by trigger Forward/reverse rotation LED job light will light up the work area in dark conditions Brushless motor for maintenance free and more efficient operation Compact design with overall length of 147mm Phosphorescent bumper Ergonomic soft grip Equipped with Battery protection circuit: designed to protect the battery from damages due to over-discharge, high temperature or overload current Battery fuel gauge Reverse rotation auto stop mode: This mode works only with pulling the trigger fully in a counter-clockwise rotation. When the bolt/nut gets loosened enough, the tool stops the impact and rotation in 0.2 seconds Specifications: Nut Busting Torque: 400 Nm Driving Shank: 1/2" Square Blows per Minute (Hi/Med/Lo) - ipm: 0 - 3500 / 0 - 2600 / 0 - 1800ipm Standard Bolt: M10-M20 High Tensile