Sds drills are so called because of the type of drill bit they use an sds drill bit or chisel has a special grooving at the end of the shaft this locks securely into the special chuck of the sds drill and thus virtually eliminates any chance of the drill bit slipping in the chuck when the drill is being used typically this type of drill is used for heavier applications many sds drills have 3 modes functions as is the case with the einhell 3kg 900 watt sds rotary hammer drill this machine offers