Mobile base - This optional Otter Shower Stand holds the Otter Bath Chair securely on its frame with quick-release locks. The aluminum frame height is 21" (53.3 cm) for easier transfers, as well as for use in the shower. It measures 27" (68.6 cm) wide by 33" (83.8 cm) long at the base. The weight capacity is 200 pounds. The Otter Shower Stand comes complete with 4 swivel locking casters. Some assembly is required.