Eobasileus was 4 metres (13 ft) long and stood 2.1 metres (6.9 ft) tall at the shoulder; and with a weight up to 4000 kg (8818 lbs) it was the largest Uintathere.[1] It looked very similar to the related Uintatherium. Like Uintatherium, it had three pairs of blunt horns on its skull, possibly covered with skin like the ossicones of a giraffe. The frontal pair may have been composed of keratin, like the horn(s) of a rhinoceros. Eobasileus also had a pair of tusks which were shielded by bony protrusions of the lower jaw.