Tiny Tuesday: (Solid or) Hard...as Nails

Loisbiz would like something solid or hard for today's TT challenge. I remembered that somewhere we had some of those metal puzzles which challenge you to separate the parts and my Editor kindly found this one for me. It's not all that tiny but it's only 10cm across as seen on this close-up photo so hopefully it'll qualify for the challenge! (We thought we had some smaller ones but we couldn't find them.)

Not only is it as hard as nails, it's also a very hard puzzle to do!