The MC-030-B is created from high tensile, aircraft grade, extruded aluminum; so it’s both stronger and lighter than cast iron clamps.
The MC-030-B fits from 1” pipe to 2” pipe sizes (1-15/16” OD to 2” inch OD tubes.) This means you can hang fixtures from a 2” pipe without having to buy an expensive “Heavy Duty Clamp”. The MC-030-B fits the larger pipe standard.