The two bottom items are about 8cm..the top is about 12cmand the circle is same size as a nickel...they were found while metal detecting a beach, northwester Ontario Canada and all came out of the same hole about 2.5-3f deep
The piece on bottom right is an Old Copper Culture point. Maybe a tanged point, with the tang bent. Nice! I'm not familiar enough with OCC artifacts to say anything about the other finds. I'm guessing the second piece from top is also Copper culture, though.