1. Hammering mechanism features air channel system Up to 50% more volume of air cushion *3 reduces wear and damage inside cylinder. 2. Ball bearings Ball bearing seals in grease and holds temperature low to protect melt down of gear cover. 3. New internal pressure control mechanism Provides smooth airflow in or out of the gear cover to stabilize and ensure hammering action. 4. Powerful motors and optimized hammering to improve work efficiency. As of June 2013. Among 2kg class rotary hammers made by leading power tool manufacturers, surveyed by Hitachi Koki. Angle adjustment function (3-mode models only) When using a cold chisel or cutter, the orientation of the tool tip can be adjusted by setting the change lever as shown on the left. Soft and easy to grip for comfortable operation! Double-molded side handle Simple bit mounting One-push action for quick bit mounting5: Weight: According to EPTA-Procedure 01/2003. 6: The tri-axial vibration values were measured according to EN60745-2-6. Note: Manufacturer reserves the right to change specifications of parts and accessories without notice. Specifications and standard accessories may vary from country to country.