In a push button dental turbine it retains the bur and the rest of the turbines hardware sits on.
A fan-blade that when pushed with air spins and powers the dental drill.
An o-ring provides suspension for the turbine. It absorbs the vibration between the dental handpiece and turbine.
This acts as a stop between the handpiece and bearing. It helps prevents misalignment of the front dental bearing.
A washer that alleviates vibration by creating preload between the dental turbine and handpiece.
A stop washer with a lip that also keeps debris out of the front dental bearing.