This is an upper carrying plate used on a custom 8-inch Sieve Shaker. The metal version of a similar version of this costs 290$ and the plastic version costs 117$. The plastic plate can easily be used instead of the metal one as it is just a carrying plate and not much forces acts on it. This is the simplified version of the general plate used on a shaker. Two rods go from the 2 holes on both the sides of the plate and are tightened with a nut to keep the sieve together.