Best SDS Rotary Hammer Drill – Head to Head Testing
Bit Change Winner – All Way Tie
The Special Direct System developed by Bosch in 1975 revolutionized hammer drills allowing a cylindrical shank fit into the chuck with indentations that lock the bit into place yet allows the bit to move up and down a short distance. Therefore you can expect this technology and the accompanying chucks to be standard across the board, hence the all way tie.
Although the one and only discriminator we found was that the Bosch RH540M did not feature a quick change chuck, meaning it was the only model that required you to pull the chuck back to insert the bit, where all other models would accept the bit without moving the chuck and only required pulling back the shroud when removing bits.
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