these are spacers for the Dorcy mini diy red laser. They are designed to fit inside the head of the flashlight to wick the heat from the Aixiz module to the head of the flashlight. The heat generated by the module is incredible and it needs to be pulled from the module to the head where it can be wicked away by air.
Interesting... that's too small for solder and too big for epoxy! What I use in such situations is aluminum foil or copper foil... Both would do the job just fine...