The Estes Pro Series II 29mm Engine Retainer Set includes the parts to create two screw-on motor retainers for your model rockets. The retainers allow you to quickly load and unload engines from your rockets. The threaded part is permanently glued to the end of your rocket's motor tube.
The other part acts as a cap and screws on to hold the motor in place.
This product was added to our catalog on Tuesday 08 October, 2013.
