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.
