Sergeants Emily and Will Hart, twin siblings, became Steelheart and Steelwill, respectively, when they joined the SilverHawks. They are the "gearheads" of the team. They share an empathic bond in that when one sibling feels something, the other feels it as well. Physically, they are the strongest members of the Silverhawks team. They are the only SilverHawks who have had real stainless steel hearts implanted during their transformation. Their weapon-birds are Rayzor (for Steelheart) and Stronghold (for Steelwill). Their armors have the same dark steel tone shade.