All the jaw types, such as serrated (R), smooth (S), diamond-coated (D), additional piece models (T), grip models (G), self-aligning (B), machinable (M), etc., are suitable for the Multi-Rail RM system.

D-size (12 mm or 1/2" bolt) and B-size (M8 or 5/16" bolt) clamps are most commonly used in the Multi-Rail RM system.

RMC overview foto 1 w800

There are various clamp modules - RMC-DR, RMC-DS, RMC-DT, RMC-BS. 

In the RMC-ab code format a=size and b=jaw type.