Makita HR2641X1 SDS-PLUS 3-Mode Variable Speed AVT Rotary Hammer with Case and 4-1/2" Angle Grinder, 1" Powerful 8 AMP motor delivers 2.1 ft.lbs. of impact energy to handle the most demanding applications Anti-Vibration Technology (AVT) is an internal counterbalance system that greatly reduces vibration Integrated damper spring at the base of the impact bolt is engineered to absorb impact vibrations from the drill bit Retractable tool hook secures the tool when not in use Recessed hammer function selector located below gear housing for improved durability