The person who made these things used sections from a sickle bar used in farm machinery that cuts grain or hay. The sides of the pointy end are very sharp. If you are familiar at all with farm stuff you will know exactly what I mean--if not this is impressive anyway.
I will not be surprised if some pieces like this start showing up around North Star Ohio. When Jerry and the guys at NS Implement see these pics they will be all over the sickle blade art concept. With all the used blades laying around plus all the creativity in that group it is a good bet that there will be a 20 foot high Tiger shaped statue standing in the North Star town square before football season starts.