These are replacement feet for a camping chair. The files include models for the front feet and then for each rear foot. Print 2 of the front feet and each rear foot as the rear feet have holes oriented in a particular way for mounting to the vertical chair members. These aren't swappable. Recommend 5 shells all around and 30% infill for a strong part that will stand up to abuse.
IMPORTANT: Take photos of the positions of the bars as it relates to each foot as they don't all align the same way. Each foot attaches differently so it's good to have a reference as it can be frustrating to put the feet back together otherwise.