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We See SDS in hammer drill and we wonder what does SDS in drills stand for, SDS is simply the bit retention system — or how the bit is held in the drill. There is some debate as to what the "SDS" acronym stands for. The original German interpretation was "Steck-Dreh-Sitz" meaning Insert-Twist-Stay. As the bit evolved, it has come to be known as a Slotted Drive System or Slotted Drive Shaft. Some Technical people also say that SDS stands for Slotted Drive Shaft or Slotted Drive System. SDS bits a …