The full meaning of SDS is Slotted Drive System. It's also referred to as the Slotted Drive Shaft. In 1975 appeared the first SDS carbide drill bits. They were created as a solution to the problems faced by the masonry workers, drilling holes and other hard materials. This led to the creation of the rotary hammer and a new hammer drill. The Slotted Driven Shaft functions by sliding into the chuck, to enhance the tool’s hammering action.