The final installment of the Iron Hands is the bikes. Two big squads, both with attack 'trikes' so they can split down into combat squads to make 4 scoring units. It was a fun idea but in the few games I played with them never really worked as well in practice as it looked on paper.
While it never worked for me - bear in mind I don't play 40k often which probably has a lot to do with their tactical ineffectiveness! The trikes were fun to make, I like a good kit bash now and again and the whole triple barrell multimelta thing always makes me happy.