These are type 304 Stainless A 50 x 50 with a 16mm slot
alignment shims for the alighning of electric motors ect.
These are type 304 Stainless B 75 x 75 with a 22mm slot
These are 304 Stainless type C 100 x 100 with a 32mm slot
These are type 304 Stainless D 125 x 125 with a 45mm slot
These are type 304 Stainless F 150 x 150 with a 55mm slot
These are 304 Stainless type E 200 x 200 with a 55mm slot