The 1-9/16 in. AVT Rotary Hammer (model HR4013C) has 45% less vibration and 20% more impact energy than the previous model. It is engineered with enhanced Anti-Vibration Technology (AVT), a synchronized 3-component system for significantly less vibration. The result of the enhanced AVT is a category-leading vibration rating of 5m/s. The powerful 11 AMP motor delivers 8.4 ft. lbs. (11.4 Joules) of impact energy, 20% more than the previous model for faster drilling. An added feature is the option of lock-on or trigger-activated in the chipping only mode, with a push button start/stop control for more convenient operation. This promotional item also comes with a Bonus 192108-A 3/4 in. x 10 ft. Vacuum Hose and a Bonus 196537-4 Dust Extraction Attachment, SDS-MAX, Drilling and Demolition, HR4013C. The Makita Vacuum Hose (3/4 in. outer diameter x 10 ft.) is ideal for use with the Makita random orbit sanders. The Makita Dust Extraction Attachment (196537-4) is engineered to reduce the dust created from concrete drilling when used with a jobsite vacuum (sold separately). The Dust Extraction Attachment fits the Makita 1-9/16 in. AVT Rotary Hammer model HR4013C. The 196537-4 includes both drilling and demolition boots for greater versatility and multiple applications. The Dust Extraction Attachment is part of Makita's expanding line-up of dust extraction solutions, including the VC4710 Jobsite Vacuum (sold separately).