The Makita DTD171 impact driver is one of the most versatile and flexible impact drivers on the market. Makita DTD171Z Impact Driver 18v with a 1/4″ Hex Drive and powerful brushless motor plus electronic 4-stage impact power selection and x4 assist mode variations: wood mode, t-mode for thick metal plate, t-mode for thin metal plate and bolt mode. Other features of this very useful DTD171Z Makita Impact Driver includes quick mode switching function with memory function, electric brake, variable speed trigger control, forward or reverse rotation with a bright LED joblight for safe work in low light areas around the site. This 18v Makita Impact Driver uses a one touch sliding chuck for easy one handed bit instal and removal plus an ergonomically designed high comfort grip and handy belt clip. Features: Electronic 4-stage impact power selection + 4x Assist Modes. 4x Assist Mode Variations: Wood mode, T-mode for thick metal plate, T-mode for thin metal plate and Bolt Mode. Quick mode switching function with memory function. Brushless motor. Electric brake. Variable speed control by trigger. Forward / reverse rotation. LED job light. Ergonomically designed high comfort grip. One touch sliding chuck for easy bit installation and removal. Makita DTD171Z Specifications: Voltage 18 v Standard Bolt M5-M16 High Tensile Bolt M5-M14 Coarse thread (length) 22 – 125 mm Max Fastening Torque 180 Nm Blows per Minute (Max) – ipm 0 – 3800 ipm Battery Type Lithium-ion Vibration: Fastening Bolt 13.5 m/sec² Vibration K factor 1.5 m/sec² Noise sound pressure 97 dB(A) Noise sound power 108 dB(A) Noise K factor 3 dB(A) Body only machine Net weight 1.2 – 1.6 kg No Load Speed (max/hard/med/soft) 0- 3600 / 3200 / 2100 / 1100 rpm Impact Selection 4 stage + Tek mode (x2) + Assist mode (x2) Driving Shank 6.35mm (1/4″) Hex Blows per Minute (Hi) – ipm 0 – 3600 ipm Blows per Minute (Med) – ipm 0 – 2600 ipm Blows per Minute (Lo) – ipm 0 – 1100 ipm Machine Screw M4-M8 NB: BATTERY, CHARGER & CASE NOT INCLUDED!