Includes 4 x mounts each in 2 parts. 4 x M3 button screws. 4 x M3 flat screws. 4 x thicker threaded base magnets and 4 x thinner corresponding magnets. Once assembled the posts measure 20.6mm long. Magnets measure 12mm in diameter. What fits where. The blue hollow cap section fits the body posts 5.9mm diameter. The thinner magnets stick onto the shell however glue is not included. The magnets simply hold the shell in place. Note navy blue set for sale only. The light blue set shown in the second picture is for illustration purposes only.