I'm trying to identify a type of clamp that can hold some piece perpendicular to a surface. The clamp looks like two cylinders molded together by an arc shape. The arc shape exerts a spring force. See the figure below. Left: the red circle outlines the clamp. It is embedded in some epoxy, and the white rectangle is a blank label that can be seen through the epoxy. Please ignore the epoxy and the label. Right: a side-view schematic of the clamp (not to scale).
In the photo on the left, the part is holding "piece held in place" perpendicular to the circular faces of the epoxy. In the schematic on the right, the black lines represent a cross-section of the clamp itself. The physical cross section should have about 1mm thickness.
I want to order the clamp itself, but do not know what search terms to use. The clamp material is a type of plastic, though I'm pretty sure metal ones are also sold. Please direct me to the right community if this is not the proper place for this question.