The RER30386 Inner Portal Axle Box (Brass) is a drivetrain component designed to house and protect the internal portal gear assembly in compatible RC vehicles with portal axles. Manufactured from durable brass, this portal axle box provides enhanced strength and resistance to impacts, helping shield internal gears and bearings from dirt, debris, and abrasion encountered during off‑road use. The added brass mass can also improve traction and vehicle stability, particularly in crawling and technical terrain. Precision‑formed surfaces ensure a secure fit with mating components, helping maintain proper drivetrain alignment and reliable performance. This part is ideal for replacing worn, cracked, or damaged inner portal axle boxes during routine maintenance or performance upgrades.