Worth every penny
Before I saw these, I wanted them.  I wanted seashell ornaments for my tree so I bought a new drill-bit and started.  OMG even with an expensive drill, excellent drill-bit, and good shells this is really NOT easy (and I am pretty handy with the tool set).  The drill bit ended up looking burned with the amount of friction.  It took me hours to do 10.  It only took a few minutes to order 10 more on Amazon. Thank you Land to Sea.
Rating: 5 stars