These 'F' models comes with an additional quick-change keyless chuck for straight shank drill bits. Features: Intelligent KickBack control (KBC) in order to minimise the risk of injury to the user. Active vibration damping with counter oscillator for minimal vibration levels. Magnesium gear housing for improved robustness. Ball grommet for preventing cable breaks. Rotating brush plate for equal power in forward and reverse rotation. Overload clutch to protect the user and the machine. Forward/reverse rotation for dislodging jammed drill bits. Continuously variable speed control for clean drilling starts. Locking button for continuous and fatigue-free work.