This is a manual xy table for an AmScope microscope. I removed a few parts from the fixed table to get measurements. You have to screw the three screws from the condenser onto the underside of the base. Then put all the pieces together, they only go one way. Move them until the action is as smooth as you want it. Then mount the table to the scope with the two big hex screws underneath. The top part has a cutout for a piece of glass.