Makita DTW285RMJ LXT 18v Brushless 1/2\" Impact Wrench inc 2x BL1840B 4.0Ah Batteries, DC18RC Charger and Makpac Type 2 Carry Case The Makita DTW285 with Brushless Motor is very similar to the DTW281, but with the added improvement \"Reverse Rotation Auto-Stop Mode\". This intelligent function works when the bolt/nut is loosened enough, the tool stops the impact and rotation in only 0.2 seconds. Supplied as body only, batteries, charger and case supplied separately. This RMJ kit includes the DTW285 tool, 2x BL1840B 4.0Ah lithium-ion batteries and a quick DC18RC charger - all packed in a Makpac type 2 carry case with plastic inlay tray. MAKITA DTW285RMJ FEATURES Reverse rotation auto stop mode: This mode works only with pulling the trigger fully in counter-clockwise rotation. When the bolt/nut gets loosened enough, the tool stops the impact and rotation in 0.2 seconds Compact design with overall length of 147mm Equipped with Battery protection circuit: designed to protect the battery from damages due to overdischarge, high temperature or overload current Battery fuel gauge Phosphorescent bumper Ergonomic soft grip Electric brake Variable speed control by trigger Forward/reverse rotation LED job light Brushless motor MAKITA DTW285RMJ SPECIFICATION Voltage: 18v LXT Nut Busting Torque: 400 Nm Max Fastening Torque: 280 Nm Driving Shank: 1/2\" Square Blows per Minute (Hi): 0-3,500 ipm Blows per Minute (Med): 0-2,600 ipm Blows per Minute (Lo): 0-1,800 ipm Standard Bolt: M10-M20  High Tensile Bolt: M10-M16  No Load Speed (hard): 0-2,800 rpm No Load Speed (med): 0-2,100 rpm No Load Speed (soft): 0-1,600 rpm Net weight: 1.7 kg DTW285RMJ NOISE & VIBRATION Noise sound pressure: 96 dB(A) Noise sound power: 107 dB(A) Noise K factor: 3 dB(A) Vibration: Fastening Bolt: 11.5 m/sec² Vibration K factor: 1.5 m/sec²