Inhalers with an inhaler housing having adose container disk having inner and outer perimetersmounted in the housing. The dose container disk has aplurality of circumferentially spaced apart dose containerswith dry powder therein. The inhalers also include apiercer carriage with a piercer mounted in the inhaler. Thepiercer carriage is in communication with a resilient memberthat radially biases the piercer carriage to radiallytravel to align the piercer with an underlying or overlyingdose container.