For glass and wood orbs, round stones and marbles. The top is 13/16" diameter and the stopper is 1 1/2" tall. The recess has nicely rounded edges, is 1/16" deep with a 3/8" non threaded hole for glass artists who like to insert a little of the mandrel for added gluing surface.
Adhesives recommended by glass and stoneworkers:
Hxtal is the very best, click here for info.
Loctite 349: optically clear, stong. Hardware or Hobby shops.