SDS and SDS plus are interchangeable. > > However, SDS plus drill bits have four large drive/engagement grooves and when used in a SDS plus hammerdrill a stronger connection capable of more rotational torque results. (SDS has only two of the large grooves) > > SDS Max is not interchangeable with either of above but is even heavier duty. > > Spline Drive is not interchangeable with any above and is also heavy duty.
