Stabilzer Boom Fin Unit for 18mm tubes

Designed for the Mercury-Atlas for single motor boost , this Stabilzer boom fin unit  will fit basically any design using 18mm body/ motor-mount tubes, for parallel body designs, that uses them in  pairs( i. e. Space shuttle, Orion, ULA vehicles, etc.). However, can be used for single unit based on other designs. Responsibilty of stabilty performance to any other design is at your discretion, of course.