RB54, Retainer Body, 54mm

Retainer Body, 54mm, Universal (with flange) Light-Weight Retainer Body Only For 54mm Motor Mount Tubes Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Black Anodizing Six 6-32 Stainless Cap Screws and Threaded Inserts Included Installation: Flange-to-Centering Ring Attachment, No Adhesive! Can Be Installed On Existing Rockets With Minimum Airframe I.D. of 3.000" (Aeropack)