RA54, Retainer Assembly, 54mm

Retainer Assembly, 54mm Light-Weight Assembly For 54mm. Fastens too lower centering ring with flange and included hardware Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Black Anodizing Large Quick-Turn Threads For Fast, Tool-Free Motor Change Installation: Mounts to lower centering ring with 6 threaded inserts and 6 stainless steel socket head cap screws. Just Slide Motor In And Thread On Cap, That`s It! Can Be Installed On Existing Rockets. Minimum airframe I.D. = 3 inch. (Aeropack)