Stem casters have a stem on the top of the caster that is used to secure the caster to the bottom of equipment such as carts, office furniture, scaffolding, and racks. The casters allow the equipment to roll, which reduces the effort required to move or reposition the equipment. Stem casters are typically used to add casters on equipment where there is not enough room on the equipment's mounting surface to attach a plate caster's mounting plate, such as equipment with tubular frames and legs. Each caster should be installed so that its upper raceway is flush against the surface it's being mounted to in order to achieve the maximum load capacity for the caster.