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Introduction If you’ve ever worked with a rotary hammer or masonry drill, you’ve likely come across the term SDS but what exactly does it mean? SDS stands for “Slotted Drive System” or “Slotted Drive Shaft,” a revolutionary design that has transformed drilling performance in concrete, stone, and other tough materials. Developed by Bosch, the SDS system replaces the traditional chuck-and-key design with a slotted shank mechanism that locks securely into th …