Character Bios from package tech specs:

As part of the Micromaster Combiner force, each member of the Decepticon Constructor Squad can be separated from its partner and re-combined with another Micromaster combiner to forma an incredible new Micromaster Combiner constructor! Can turn new ideas into structural monsters of hard concrette! Known for constructing monuments at Deception headquarters after every Autobot conquest! Enjoy watching the destruction of something beautiful so they can build a frightfully ominous edifice in its place! Together, they're unbeatable. When separated, too busy trying to out-design each other. They take pride in construting rather than destroying. Will build anything, anywhere, anytime for the highest bidder! Combine to form Crane, Dump Truck and Ground Digger vehicles.

Stonecruncher: the yellow and orange front half of the crane vehicle and Excavator the back half of thie same
Grit: the purple and yellow front half of the back-hoe truck vehicle with Knockout the orange and purple back segment.
Sledge is the orange and yellow front half vehicle along with Hammer the back half.