This is a custom replacement mounting bracket for the Merkery Smart Solar Spotlight (available from Walmart).  The original has a ground spike or screw mount fitting. I needed something to clip around a 22.5mm square cross beam of the frame above our deck. Designed the slide-on clip mount for easy installation and removal. Insert the rubber seal from the original mount to ensure the light position will lock in place. 

Printed in Black PETG with a 0.28mm layer height. Separate the two pieces on the build place and print with the back face on the plate. No supports needed. 

Autodesk Fusion 360 model file is included for customization.