The 1-9/16" SDS-Max Rotary Hammer, model HR4010C also features AVT Technology with 2X less vibration at only 4.5 m/s² plus produces 2,750 blows per minute. Model HR4011C produces an impressive 11 AMPS with 9.5 joules (7.0 ft.lbs.) of impact energy and has synchronized RPM and BPM to prevent overlapping impacts for up to 50% more efficien
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