Thanks to the vertical placement of BL motor Compact: Only one hand size Equipped with a compact, lightweight and powerful BL Motor Operation can be done light and speedy. Driving part, Motor and Battery section are placed near Handle. Moving the center of gravity to user’s hand reduces his fatigue as well as a load to his arm. Optimum weight balance for easy overhead application Anti-vibration Handle is placed separately from Vibrating section. Furthermore vibration is absorbed by Vibration control spring and Rubber ring. Low vaibration reduces fatigue. Perfect Accessory set for drilling/ screwdriving applications You can install a self-made shelf easily with this machine. HR166D’s CXT battery corresponds to CL106FD/CL107FD.