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These corner feet are meant to be attached to the bottom 4 corners of a box or case. The corner spheres also slightly raise the bottom of the box to allow air circulation. The bottoms of the spheres have been slightly flattened where they would contact the surface upon which the assembled case rests.
A small extension tab has been added to each corner foot to provide additional surface area for glue or epoxy. In addition a small starter pilot hole is available on each tab for use with a screw for attachment.
The four feet are connected by an X-shaped sprue network and can be separated using a small pair of wire cutters or snippers.