The Makita 18V Li-ion Cordless Impact Driver, DTD171, offers users four speed settings, as well as 4 specifically designed fastening modes for optimum control. The impact drivers electronic controls find the best balance of speed and torque for each application for more efficient fastening. The 4-speed power selection switch provides the user with precise fastening control for a range of applications, from cabinet screws to lag bolts. XPT technology that protects against dust & moisture. Ultra compact design with twin dual side LED lights. Drive shank: 6.35mm (1/4) Hex. Max tightening torque: 180Nm. Max: 0 – 3600rpm. Hard: 0 – 3200rpm. Med: 0 – 2100rpm. Soft: 0 – 1100rpm. Max: 0 – 3800ipm. Hard: 0 – 3600ipm. Med: 0 – 2600ipm. Soft: 0 – 1100ipm. Standard bolt: M5 – M16. High tensile bolt: M5 – M14.