38mm to 54mm adapter for use with Aeropack 54 mm motor retainers only.

• Ready to use!
• Precision Machined and Type II Black Anodized 6061-T6 Aluminum
• A3854 Fits 38mm Motors to Rockets with 54mm Retainers
• No Need To Buy a Separate Motor Retainer
• Everything Slides In & Out Easily with No Friction Fitting
• Adapter and Motor Install in Seconds
• Motor is Retained from Moving Forward or Backward