The GPM MB021 front and rear knuckle arms are precision-machined alloy replacements for the HPI Minizilla that focus on enhanced steering control and long term durability. Manufactured to tighter tolerances than stock plastic components, these alloy knuckles provide a more consistent steering response and better resistance to wear during typical hobby and racing use. They are suited to model owners looking for a reliable, drop-in upgrade to harden their steering system.