Makita HR4510C 1-3/4 Inch Rotary Hammer with Anti-Vibration Technology. The 1-3/4" Anti-Vibration Rotary Hammer (HR4510C) from Makita merges extreme power with precision control and user comfort. The 13.5 AMP motor puts out a massive 1,250-2,750 BPM. The RPM are synchronized with the BPM in order to prevent overlapping impacts - yielding up to 50% more efficient drilling. The user can operate the variable speed control and the 2-mode operation to select between "Hammering with Rotation" and "Hammering Only" in order to get the best performance for the job. The Anti-Vibration Technology (AVT) dynamic vibration absorber ensures extra-low vibration performance and lower strain on the user.